Mullard factory codes chart. Philips owned Mullard.

Mullard factory codes chart 5) and the R/D 54 which was used for radio valves. 00 EL84, MULLARD, NEW SHIELD, KM1 B4L2, BLACKBURN NOVEMBER 1974 PRODUCTION EFC82, MULLARD, FADED YELLOW PRINT, FACTORY CODE, 4X5 L3C1, MBLE BRUXELLES 1963 MANUFACTURE On offer today, a smashing ECF82 by Mullard . Oct 9, 2024 · Brent Jessee lists factory codes and production codes. ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324I2 EF86, MULLARD, MESH SCREEN, FACTORY CODE, 9r3 D5c5, HEERLEN, MARCH 1965 MANUFACTURE On offer today one of these striking devices. Apr 23, 2019 · If its a 3 character code, the valve was produced pre 1960. Mullard Magic: For All Your Vintage Valve and Radio Needs! ECC88, MULLARD, MATCHED PAIR, SAME FACTORY CODE, GA2 B7K1, BLACKBURN OCTOBER 1967 MANUFACTURE, ECC88. Mitcham ones after 70 have different construction and sound different. mullard made in england. factory codes in glass. (later Thorn) East German origin (after 1 Jan 1970 Philips / Amperex / Mullard / Valvo two digit codes Code Type Comment Code Type Comment Code Type Comment AC AW43-89 BX XL36 C5 E288CC AD EC88 BY MX153 8223 AE EL500 BZ YL1000 C6 ECC808 6GB5 Bf CV4049 C7 EC900 AF 6EU7 B1 M2PE C8 PCF801 AG CV4035 B2 M3DV 8GJ7 AH PY33 B3 M4PCF C9 XCF802 AI DL97 B4 M7EF C+ LCF802 AJ ECC230 B5 95400 6LX8 6080 B6 4-OA31 Apr 23, 2019 · The factory, date of manufacture and revision of a particular tube can be determined from a code that’s etched into the side of the glass envelope (the colour of the lettering, i. This is much more complicated since there is no standardization on that, each factory used their own codes. Nver to be repated. 2 is the change code, probably a 2nd production run with updates from run #1. D1, ARD2, CV1078 where the first notation is the valve descriptor and the second and successive notations are equivalent notations for either IERC, military common value. Besides the orange ink printing showing Raytheon 12AU7, made in USA, there's another mark in grey saying USA, 12AU7A. The second row of codes tell you the factory it was made at and the date it was made. B means the Mullard factory at Blackburn, England. May 16, 2020 · i believe all E88CC/6922/CV2492/CV2493 were made at Mitcham factory (code R). 2 is the change code which tells you what revision of the tube you have, like a model number. . Some most popular change codes for ECC83 (dates are very approximate): Mullard 4. Since "b" is the code for Mullard, made in Blackburn England, you know the tube was made by Mullard. The 161 is for the ECC83/ 12AX7 tube Don't take my word for this though as I'm new to this Mullard code dating as well :scratch2: CV2901, MIL SPEC, EF86, MULLARD, MESH SCREEN, FACTORY CODE, 8Y6 L9K2, BRUXELLES, NOVEMBER 1969 MANUFACTURE On offer today one of these striking devices. Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following result ECC81, MULLARD, NEWSHIELD, WHITE PRINT, FACTORY CODE, VF3 B1D2, BLACKBURN 1961 MANUFACTURE On offer today is a lovely Mullard ECC81, a premium quality ECC81 carrying the date code for 1961. ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324I2 CV493, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, FACTORY CODE Yy1 J6D, 1956 MANUFACTURE On offer is a Brimar 6X4 rectifier . As well as the production testing we discussed in a recent blog entry, Mullard employed Quality Control (QC) testing where a sample of ten valves were taken at regular intervals and subjected to a range of tests. Some have the old shield Mullard logo, some with the old BVA logo, many were made for Amperex OR Fisher or other labels. The first part, of format number-letter-number is the date code where the first number signifies production week of month, the following letter signifies the All we are concerned with here is the Manufacturer code. The date code is two lines and stamped in a dark ink but legible under light and a magnifying glass. EL37, MULLARD, BROWN BASE, MATCHED QUAD, SAME FACTORY CODE, R61 B7K, BLACKBURN NOVEMBER 1957 MANUFACTURE, CV586, EX MILITARY BULK PACKED NOS Well, probably one of the last NOS quads of these legendary pentodes anywhere. Carries both the military cartouche and commercial printing on the obverse as shown in the photos. CV493, BRITISH TUNGSRAM, MIL SPEC, 6X4, WHITE PRINT, FACTORY CODE Yy1 J6D, 1956 MANUFACTURE On offer is a Brimar 6X4 rectifier . I have several NOS Mullard EL34's, dark choc. new and unused in original government carton. Mullard Magic: For All Your Vintage Valve and Radio Needs! EL84, NEC, MATCHED PAIR, SAME FACTORY CODE, 1970s PRODUCTION, Envelopes shows good white print and superb inter valve matching EL37, MULLARD, BROWN BASE, MATCHED QUAD, SAME FACTORY CODE, R61 B7K, BLACKBURN NOVEMBER 1957 MANUFACTURE, CV586, EX MILITARY BULK PACKED NOS Well, probably one of the last NOS quads of these legendary pentodes anywhere. D: - Valvo, Hamburg (Germany) G : - Mullard, Fleetwood. I worked at Glass Bulbs Ltd for over 30 year (1962-98) and, amongst many of our UK customers was Mullard Blackburn. single piece. CV2492, MIL SPEC E88CC, MULLARD, MATCHED PAIR, SAME FACTORY CODE, 7L1 RAC2, MITCHAM MARCH 1963 MANUFACTURE, E88CC On offer today we have this beautiful E88CC matched pair. K. 00 ECC81, MULLARD, YELLOW PRINT, Tk3 B3I3, BLACKBURN, MARCH 1963 PRODUCTION cv2821, mil spec ecc33, mullard, brown base, 5k b5f, blackburn 1955 production Regular price £155. Jun 7, 2018 · I know many of my readers find my CV numbers and Factory Codes blog post useful but I am frequently asked for a date code listing. I don't see any of that. 00 ECC33, MULLARD, BLACK BASE, FAINT PRINT, WHITE BOX, ecc81, mullard, old shield, yellow print, factory code, tk3 b5a3, blackburn 1965 manufacture Regular price £40. ECC81, MULLARD, OLD SHIELD, YELLOW PRINT, FACTORY CODE, Tk3 B4D1, BLACKBURN 1964 MANUFACTURE On offer today is a lovely Mullard ECC81, a premium quality ECC81 carrying the date code for 1961. Same construction, both labeled Gt. The factory at this time was thriving with 5,800 employees producing electronic valves. Philips owned Mullard. They have the vertical EMI logo and Mullard Electronics under this logo. EF86, MULLARD, MESH SCREEN, FACTORY CODE, L6D3, MBLE BRUXELLES, APRIL 1956 MANUFACTURE On offer today one of these striking devices. J : - Mullard ( British Tungsram), Tottenham Here is an example of a Mullard Blackburn, UK factory date code: The first line is rX2. These show superb matching of both anode current and mutual conductanc cv2821, mil spec ecc33, mullard, brown base, 5k b5f, blackburn 1955 production Regular price £155. - I have never seen an 'E' factory code tube, but apparently they exist! Hyperlec Brive (Correza, Spain). Instituut voor Fysisch Onderzoek E Hyperlec Brive (Correza) F La Radiotechnique, Suresnes f Marconi . L2k2 "L" is the code for May 27, 2021 · "Mullard finally sold all its shares to Philips in 1927. cv2821, mil spec ecc33, mullard, brown base, 5k b5f, blackburn 1955 production Regular price £155. Mullard 10M Master Series ECC83: These were specially made, later production Mullard short plates that are rated for 10,000+ hours in a tube amp. ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324 C3 Mullard Magic: For All Your Vintage EF86, MULLARD, MESH SCREEN, FACTORY CODE, 8Y5 L6C2, BRUXELLES, MARCH 1966 MANUFACTURE On offer today one of these striking devices. Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following results: ECC81, MULLARD, NEWSHIELD, WHITE PRINT, FACTORY CODE, VF3 B1D2, BLACKBURN 1961 MANUFACTURE On offer today is a lovely Mullard ECC81, a premium quality ECC81 carrying the date code for 1961. . As you can see from the test results we have excellent emission from each triode section within the envelope and superb intra section matching. Nov 30, 2008 · I have broken the code on my Mullard EL34 tubes. Dec 10, 2013 · There were three different black base GZ34 manufactured by Philips. Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following results CV2901, MIL SPEC, EF86, MULLARD, MESH SCREEN, FACTORY CODE, 8Y6 L9K2, BRUXELLES, NOVEMBER 1969 MANUFACTURE On offer today one of these striking devices. 220 in stock. The Manufacturer code is always the first symbol on the second line. These rare tubes are hand matched. An example of a rare Mullard 12AX7 code is: Mc1. 00 ECC33, MULLARD, BLACK BASE, FAINT PRINT, WHITE BOX, Jan 16, 2020 · "One is a Hammond, Blackburn factory code B9H3, the other IEC labeled Mullard, GT Britain Code 1022-130, no etched code. They are stamped "6BQ5/EL84" and "Made in Holland" at the top. 00 ECC33, MULLARD, BLACK BASE, FAINT PRINT, WHITE BOX, NIB = New In Box Reboxed = replacement box for new item Used = used tested. 00. These show superb matching of both anode current and mutual conductance - just the thing for a Haf 6DJ8 Mullard made, Blackburn UK factory codes, made in Great BritainMATCHED PAIR: New Old Stock white box. ECC81, MULLARD ,NEW SHIELD, WHITE PRINT, PAIR, SAME FACTORY CODE KRADLEPAK, NOS, VF3 B1D4, BLACKBURN, 1971 MANUFACTURE On offer today is a lovely pair of NOS Mullard ECC81 Blackburn manufactured in 1971. 00 £26. New, unboxed and testing as 100% emission for each diode section within the envelope using our AVO VCM163. 00 ECC33, MULLARD, BLACK BASE, FAINT PRINT, WHITE BOX, Oct 17, 2007 · Produced at the Mullard Mitchum Factory these tubes can usually be identified by the 'R' code etched in the bottom of the glass + a Number and a Letter. Slight fading of old sheld white print Nov 10, 2015 · Or some kind of acid etch that would show the Mullard factory codes or ECC82 somewhere on the tube. Date EF86, MULLARD, MESH SCREEN, FACTORY CODE, 9r3 D5c5, HEERLEN, MARCH 1965 MANUFACTURE On offer today one of these striking devices. If its a 4 character code, the valve was produced post 1960. CV2901, MIL SPEC, EF86, MULLARD, MESH SCREEN, FACTORY CODE, MITCHAM, MARCH 1961 MANUFACTURE On offer today one of these striking devices. with a pin mesh screen around the anode plate. " This statemement is true. with a mesh screen around the anode plate and rigid internal support. EF37A, MULLARD, MATCHED PAIR, NOS, SAME FACTORY CODE, EP2 B0B, BLACKBURN FEBRUARY 1950 PRODUCTION, 5A/157D, CV358, CV5080, OM5B ECC81, MULLARD, OLD SHIELD, YELLOW PRINT, FACTORY CODE, Tk3 B5A3, BLACKBURN 1965 MANUFACTURE On offer today is a lovely Mullard ECC81, a premium quality ECC81 carrying the date code for 1961. Looking at the photograph of the Mullard ECC83 it can be seen that the code is written in Jan 29, 2016 · The second part of the alpha code identifies the factory that manufactured the device, the most commonly seen codes and their corresponding manufacturers are:- A Mullard, Blackburn, pre Jan 1951 A Thorn, Tottenham, pre April 1964 AB Sylvania-Thorn, Enfield AC Brimar - Thorn-AEI, Footscray AD Brimar - Thorn-AEI , Rochester B Edison Swan, Baldock PHILIPS FACTORY VALVE CODES Revision 10 15 February 2011. These show superb matching of both anode current and mutual conductanc ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324 C3 MARSHALL, TUBE AMP DOCTOR, MATCHED QUAD, 5881, SAME FACTORY CODES A beautiful matched quad with the cachet of being from the same production block and showing very good inter valve matching. 5 to 20. They are run-of-the-mill Bugle Boys with the white logo of the tube blowing the trumpet and a treble clef to the side. Osram Valve Co. The listing follows the convention of, first letter: year; second letter: month and the table below will act as a useful aide memoir instead of using fingers and toes to do the calculatio Feb 23, 2017 · The etched code is the way to determine exactly what you have. ) CV4004 M187 ECC83 Box plate: The CV4004 box plate Mullard is a military production tube that can be identified by its unique plate structure. ECC81, MULLARD ,NEW SHIELD, WHITE PRINT, PAIR, SAME FACTORY CODE KRADLEPAK, NOS, VF3 B1C5, BLACKBURN, 1971 MANUFACTURE On offer today is a lovely pair of NOS Mullard ECC81 Blackburn manufactured in 1971. Jul 7, 2009 · From what I was told earlier on my Eico labeled tubes they look to be made at the Blackburn England factory on April 4th of 1963. The Mullard factory produced the Philips Pentode Wonderful Mullard valves like the GZ37 and GZ34 were in fact Philips Examples of gas-filled cold cathode valves with the ‘new’ code are known with a suffix ‘A’ (and in one example ‘TT’) following the change code. Jun 12, 2017 · The second part of the alpha code identifies the factory that manufactured the device, the most commonly seen codes and their corresponding manufacturers are:- A Mullard, Blackburn, pre Jan 1951 A Thorn, Tottenham, pre April 1964 AB Sylvania-Thorn, Enfield AC Brimar - Thorn-AEI, Footscray AD Brimar - Thorn-AEI , Rochester B Edison Swan, Baldock Read and understand the codes . The first character gives the production site and some of the most common are given below:-B : - Mullard, Blackburn. This "tropical fish" capacitor colour code is for the Philips Mullard C280 metallised polyester range of capacitors. Slight fading of old sheld white print 4. glass, along with the 'B' Blackburn Code + two Numbers and one Letter. Mullard had quite a few factories plus the Philips Holland locations. f Standard telephones and Cables Ltd. This was a post on an amp BBS asking about Mullard EL34 production codes, what they mean, and my esponse: I know this has been discussed here before, but I've misplaced my hard copy of how to decipher this. Etched codes are as follows:: xf2 B9H2 : xf1 B1E2 Feb 27, 2014 · The next step would be to consider which Change Code the tube has been developed under. brown bases. Many Philips valves were produced at their Mullard factory. The codes are written in two lines on standard tubes and in two rows on special tubes (as E88CC) on the glass close to the base. b1k2. 00 £155. Many Brimar labeled tubes are actually Soviet made. Britain. Mullard Magic: For All Your Vintage Valve and Radio Needs! CV2821, MIL SPEC ECC33, MULLARD, BROWN BASE, 5K B5F, BLACKBURN 1955 PRODUCTION Jun 8, 2013 · Factory Tube Codes Siemens Halske Munich Codes Telefunken German Codes Mullard U. MARSHALL, TUBE AMP DOCTOR, MATCHED QUAD, 5881, SAME FACTORY CODES A beautiful matched quad with the cachet of being from the same production block and showing very good inter valve matching. the great mullard magic blog; our product manufacturers; other stuff amateur radio; amateur radio: 6146 6146a 6146b pa output valves; books & printed pamphlets; EF86, TELEFUNKEN, MATCHED PAIR, SAME FACTORY LINE CODES, PIN MESH SCREEN, WHITE PRINT, ULM DECEMBER 1967 PRODUCTION On offer today a matched pair of these striking devices. dual marked m8162 cv4024 military print. 1960s Blackburn, UK factory date codes. ECC88, MULLARD, MATCHED PAIR, SAME FACTORY CODE, GA2 B7K1, BLACKBURN OCTOBER 1967 MANUFACTURE, ECC88. That’s the 3 character code above Date code. Date codes are the same for all four and are: rX4 *2B4 Jul 14, 2020 · The code consists of multiple sections and usually look like: 4G9/980 (4th week of production in July of 1959, tube type 6060) BTW, if Brimar labeled tube doesn’t have the date code or it has foreign stamped on the tube, it’s not produced by Brimar, but by some other manufacturer. Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following results: EF86, MULLARD, MESH SCREEN, FACTORY CODE, 1582 L4, MBLE BRUXELLES, 1954 MANUFACTURE On offer today one of these striking devices. The ECF82 is a triode pentode which was introduced in 1954. Jun 12, 2017 · mullard magic mullard tubes mullard valves vintage radio military radio leak quad radford u52 gz34 kt66 px4 ws19 mcr1 spy set r1155 ECC81, MULLARD, OLD SHIELD, WHITE PRINT, FACTORY CODE, Tk3 B1J5, BLACKBURN 1961 MANUFACTURE On offer today is a lovely Mullard ECC81, a premium quality ECC81 carrying the date code for 1961. SINGLE TUBES ARE $60. e. In 1928 the company introduced the first pentode valve to the British market. 00 £40. If you type in the right words, you can see some internet links of Hyperlec/Philips/'Mullard satellite'. Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following results: CV2901, MIL SPEC, EF86, MULLARD, MESH SCREEN, FACTORY CODE, MITCHAM, MARCH 1961 MANUFACTURE On offer today one of these striking devices. Don't happen to know when Mullard quit making tubes but I don't believe IEC Mullard was a thing in '59. Skip to primary content 188 = GE / KEN-RAD 188-4, 188-5 (KEN-RAD factory), 188-20 (NY) 1022 = Fisher branded Mullard ECC81, MULLARD, OLD SHIELD, WHITE PRINT, FACTORY CODE, Tk3 B1J5, BLACKBURN 1961 MANUFACTURE On offer today is a lovely Mullard ECC81, a premium quality ECC81 carrying the date code for 1961. yellow-print or white-print has no bearing on the quality of the tube). *(There was actually a very short production run "Yellow Label" Mullard ECC83 produced right before this tube. This potentially gives rise to confusion with three symbol type codes however all examples have a numeric change symbol and no three symbol type code has been found to incorporate numerals. Apr 2, 2023 · 9 is the last year of the decade, 11 is week 11, so probably 1969 but possibly '79. Mullard Magic: For All Your Vintage Valve and Radio Needs! cv2975, mullard, military el84, white print, km1 b3j5, blackburn october 1965 production Regular price £26. On the second line is B2J5. Codes Philips Holland Tube Codes ===== USA Tube Codes Amperex (USA) 111 Bendix 125 DuMont 158 Eimac (Eitel-McCullough, Inc) 162 Electronic Tube Corp 169 General Electric Co (USA) 188 Hytron (CBS-Hytron) 210 Machlett 231 RCA (Radio Corp of America) 274 Raytheon 280 EF37A, MULLARD, MATCHED PAIR, NOS, SAME FACTORY CODE, EP2 B0B, BLACKBURN FEBRUARY 1950 PRODUCTION, 5A/157D, CV358, CV5080, OM5B Nov 7, 2015 · 1. Jan 26, 2021 · Interesting film. Example: I66 Δ0K4 I6 = ECC83 I66 = ECC83 of construction #6 Δ = Made in Heerlen/Holland 0K4 = Made 197 0 in November K 4th week cv2821, mil spec ecc33, mullard, brown base, 5k b5f, blackburn 1955 production Regular price £155. ECC88, MULLARD, MATCHED PAIR, SAME FACTORY CODE, GA2 B7K1, BLACKBURN OCTOBER 1967 MANUFACTURE, ECC88 Jan 22, 2004 · I haven't tried the tubes in an amp, yet, but was wondering about the date code. The B is Blackburn, UK Mullard factory, the 2 is 1962, the J is October, and the 5 is the 5th week of the month. If you still have some in an old vintage kit or some recycled ones then this article might be of help. EF86, TELEFUNKEN, MATCHED PAIR, SAME FACTORY LINE CODES, PIN MESH SCREEN, WHITE PRINT, ULM DECEMBER 1967 PRODUCTION On offer today a matched pair of these striking devices. Numbering convention as follows : eg. Gf is the tube type, in this case a 12AU7. Sep 24, 2005 · Mullard EL34 production codes. These tests differed from the production tests which were go/no-go type in that the QC tests were quantitative and the results were recorded using a series of Shewart Charts to I worked at Mullard's from 1958 until 1966, serving a student apprenticeship in mechanical engineering before engaging in several assignments in some of the many departments. We made the glass shell for bulbs (plus christmas ornaments, vacuum flask inners, fluorescent tubing and sealed beam headlight units) including the small tubing (R/T17. (later Thorn) East German origin (after 1 Jan 1970 ECC88, HEWLETT PACKARD BADGED AMPEREX, FAINT WHITE PRINT, FACTORY CODE, GA7 A2F3 HEERLEN 1962 PRODUCTION On offer today we have this beautiful AMPEREX manufactured ECC88. Halo getters with good flashing. Scroll down: Mullard, Philips, and Valvo Apr 30, 2019 · Well, we did Mullard last week so this time, lets look at the Brimar type and date codes, oft seen on valve envelopes in minuscule inked print, but what do they mean? Brimar codes come in two parts separated by a forward slash "/". Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following result ECC81, MULLARD, OLD SHIELD, YELLOW PRINT, FACTORY CODE, Tk3 B4D1, BLACKBURN 1964 MANUFACTURE On offer today is a lovely Mullard ECC81, a premium quality ECC81 carrying the date code for 1961. If its got the etch codes at the base that should confirm it for sure. Another Example of a Mazda code: I65. The site was laid out in a most efficient manner with each building allocated a letter. Etched codes are as follows:: xf2 B9H2 : xf1 B1E2 Apr 3, 2012 · See the post for all the codes. IntroductionMost Philips valves are marked with a group of symbols which contain coded information relating to thetype, place of manufacture or country of origin in the case of bought in valves, and the date ofmanufacture. It's design purpose was in VHF radio and television between 80 MHz to 220 MHz. Introduction Mullard continued to use this until adopting the ‘new’ code in 1955. " imsjry , Jan 16, 2020 cv2975, mullard, military el84, white print, km1 b3j5, blackburn october 1965 production Regular price £26. with a solid screen around the anode plate and rigid internal support. Usually looks like I61, etc. The codes are as follows: xf2 B5K4 and xf2 B5K3 From what I assertain from the code: B = Blackburn factory 5 = Year of ECC88, MULLARD, MATCHED PAIR, SAME FACTORY CODE, GA2 B5L1, BLACKBURN NOVEMBER 1965 MANUFACTURE, ECC88 On offer today we have this beautiful E88CC matched pair. ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324 C3. Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 y Oct 11, 2024 · - Pretty good chance this is a later production Philips tube, made somewhere w/Mullard label. Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 y EF86, MULLARD, MESH SCREEN, FACTORY CODE, 8Y5 L6C2, BRUXELLES, MARCH 1966 MANUFACTURE On offer today one of these striking devices. I never traced a Blackburn made E88CC even to back 1961 made ones, if ever made at that factory is very rare and prior 1960. Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following result ECC81, MULLARD, OLD SHIELD, WHITE PRINT, FACTORY CODE, Tk3 B1J5, BLACKBURN 1961 MANUFACTURE On offer today is a lovely Mullard ECC81, a premium quality ECC81 carrying the date code for 1961. After Philips ceased making the metal GZ34 in Eindhoven, Holland, in 1957, these black-base tubes were manufactured in Sittard, Holland (factory code X), Blackburn, Great Britain, Mullard (factory code B) and Brussels, Belgium, MBLE Mazda (factory code L). 00 EL84, MULLARD, NEW SHIELD, KM1 B4L2, BLACKBURN NOVEMBER 1974 PRODUCTION ECC33, MULLARD, BLACK BASE, WHITE BOX, FACTORY CODE, 1324I2 EF86, MULLARD, SOLID CHROME SCREEN, YELOW PRINT, FACTORY CODE, 9r3 B4F2, BLACKBURN, JUNE 1964 MANUFACTURE On offer today one of these striking devices. rX is the tube type for a 6BQ5 or EL84. Factory symbols A Wiener Radio Werke “WIRAG”, Wien B Mullard, Blackburn C Hendon Works, Alberton, Australia D Valvo, Hamburg d Ned. These show superb matching of both anode current and mutual conductance - just the thing for a Haf Feb 20, 2009 · Hard to say, I have the Sylvania Gold Brand 6080WA and a Mullard made Philips 6080, both phenomenal and not anything close to this "muddy" sound. Mullard Magic: For All Your Vintage Valve and Radio Needs! ECC88, MULLARD, MATCHED PAIR, SAME FACTORY CODE, GA2 B7K3, BLACKBURN OCTOBER 1967 MANUFACTURE, ECC88. Page 1 1. EF86, MULLARD, OLD SHIELD MATCHED PAIR, WITH SAME FACTORY CODE, CHROME SOLID SCREEN, WHITE PRINT, 8Y1 B5L3, BLACKBURN DECEMBER 1965 PRODUCTION On offer today a matched pair of these striking devices. Blackburn (code B) made ECC88, though having the Master facility as well. goxc nvls zrxod aziecq qbodg ugd miap nnxrt ldma czwaj