Hi folks,
I have a number of tubes that I cannot identify because the main print has warn off, but I can see the manufacture valve ID and date codes. These are Mullard valves (mostly radio/TV) that I found really cheap.
This as been useful for identifying dates MULLARD VALVE ETCHED CODES - HOW TO INTERPRET THEM – MULLARD MAGIC
I'm looking for a list of codes which matches the manufacture ID to the valve model number.
For example, these are given in the above post. But I cannot find a general list with 100s of codes anywhere!
Xf2 represents an EL34
k61 represents an ECC82
f32 represented a GZ34
I have a number of tubes that I cannot identify because the main print has warn off, but I can see the manufacture valve ID and date codes. These are Mullard valves (mostly radio/TV) that I found really cheap.
This as been useful for identifying dates MULLARD VALVE ETCHED CODES - HOW TO INTERPRET THEM – MULLARD MAGIC
I'm looking for a list of codes which matches the manufacture ID to the valve model number.
For example, these are given in the above post. But I cannot find a general list with 100s of codes anywhere!
Xf2 represents an EL34
k61 represents an ECC82
f32 represented a GZ34
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Mullard, Valvo, Mazda etc were Philips factories.
Type code is only 2 characters, in your example just the "Xf" stands for EL34.
Your list with hundreds of codes can be found here: frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf
or here: www.r-type.org/pdfs/ref4110.pdf
original philips document is here : electronbin.com/other/Philips/PhilipsCodeList.pdf
Type code is only 2 characters, in your example just the "Xf" stands for EL34.
Your list with hundreds of codes can be found here: frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf
or here: www.r-type.org/pdfs/ref4110.pdf
original philips document is here : electronbin.com/other/Philips/PhilipsCodeList.pdf
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Historical revisionism ?--
Mullard was a British manufacturer- The Mullard Radio Valve Co.Ltd ---founded in 1920 by Captain Stanley R.Mullard in Southfields -LONDON .
It wasn't until 1923 that a partnership was formed with Philips .
Mazda owned by Philips -- in what universe was that or reincarnation ?
Thorn EMI ended up owning Mazda nothing to do with Philips -- I look forward to you producing Hard -Facts before that it was Thorn itself and before that Mazda had its own factories -surprise -surprise in Britain.
And just to sink this further UK conglomerate Thorn/EMI Bought out Mullard Equipment Ltd -division of Philips in 1990 so it was the exact opposite to what you posted .
I have a lot of Mazda valve equivalent books ranging up to the 70,s and can supply factories/headquarters/addresses etc none have any relations to Philips .
Osram as I am sure you know was German -- I wont go into the history for obvious reasons .
The World,s first commercial valve for sale the "A" in 1906 at Ponders End any UK poster will know where that is --the World,s first triple-diode triode --1933 and more if needed .
Look I have Mullard side-contact valves -fitted them -yes they are Philips pre war as was Cossor --POST WW2 not pre .
Brimar valve works Crittail,s Corner -Footscray -KENT - British not Philips owned or otherwise - bought out by UK Thorn in 1960 .
How about Ever Ready now that was owned by the USA --BUT--- in 1914 it became independent and so from that time on was a British company -- yes they made valves.
Mullard was a British manufacturer- The Mullard Radio Valve Co.Ltd ---founded in 1920 by Captain Stanley R.Mullard in Southfields -LONDON .
It wasn't until 1923 that a partnership was formed with Philips .
Mazda owned by Philips -- in what universe was that or reincarnation ?
Thorn EMI ended up owning Mazda nothing to do with Philips -- I look forward to you producing Hard -Facts before that it was Thorn itself and before that Mazda had its own factories -surprise -surprise in Britain.
And just to sink this further UK conglomerate Thorn/EMI Bought out Mullard Equipment Ltd -division of Philips in 1990 so it was the exact opposite to what you posted .
I have a lot of Mazda valve equivalent books ranging up to the 70,s and can supply factories/headquarters/addresses etc none have any relations to Philips .
Osram as I am sure you know was German -- I wont go into the history for obvious reasons .
The World,s first commercial valve for sale the "A" in 1906 at Ponders End any UK poster will know where that is --the World,s first triple-diode triode --1933 and more if needed .
Look I have Mullard side-contact valves -fitted them -yes they are Philips pre war as was Cossor --POST WW2 not pre .
Brimar valve works Crittail,s Corner -Footscray -KENT - British not Philips owned or otherwise - bought out by UK Thorn in 1960 .
How about Ever Ready now that was owned by the USA --BUT--- in 1914 it became independent and so from that time on was a British company -- yes they made valves.
Hi Sorento,
This is exactly what I was looking for and I stand corrected about the two digest code. Thank you!
Hi Duncan,
That’s a fascinating history, the UK was very instrumental in this technology is seems, I’m sure Sorento did not intentionally detract from that in his comments!
This is exactly what I was looking for and I stand corrected about the two digest code. Thank you!
Hi Duncan,
That’s a fascinating history, the UK was very instrumental in this technology is seems, I’m sure Sorento did not intentionally detract from that in his comments!
Another view of Philips valve coding:
Mullard, Philips, and Valvo Tube Codes
All good fortune,
Chris
Mullard, Philips, and Valvo Tube Codes
All good fortune,
Chris
The Dutch were very smart, and much more advanced than anyone else in Europe. The
Netherlands market was too small for them. As I have heard, in 1924 they bought half of Mullard just for know-how, making it 100% in 1927, when they acquired Valvo, too.
Philips is the biggest European tube manufacturer in history and the only one that has ever made machines for tube making in industrial way. They had tube factories all over the world, from Australia and India to South America, including Amperex in the US and tens of plants all over Europe. I am not sure about Africa, but, given the traditional relations and interests, I wouldn’t be surprised if there were some plants in South Africa, too.
EI in Yugoslavia alone had more than 50 grid winders. You can imagine how many there were in Blackburn, the plant that used to make millions of tubes on weekly basis. No one else had such sophisticated machines for metal parts, all of them were state of the art. Anode presses could make complete stapled anodes, from two separate metal reels, 5.000-10.000 pcs per hour, as well cathode presses for seam cathodes, up to 10.000 per hour. There were also fully automated grid winders, mechanical robots to cut and form the stems, evan assembly was automated, to say nothing about glass and stem machines. All equipment was far ahead of its time.
Everybody knows how big brand Siemens is. However, all Klangfilm amplifiers from the 1960s used vacuum tubes made on Philips machines in the Munich plant, except for a few Gustav Bruckner heater winding machines.
Philips machines found their way even under the iron curtain. Hungarian Tungsram used Philips glass machines and cathode press. EI in the non-allied Yugoslavia run on Philips machines, too.
Etched codes are just a small indicator of the advanced thinking of Philips engineers. The code was printed during sealing process, providing that it last practically forever.
Netherlands market was too small for them. As I have heard, in 1924 they bought half of Mullard just for know-how, making it 100% in 1927, when they acquired Valvo, too.
Philips is the biggest European tube manufacturer in history and the only one that has ever made machines for tube making in industrial way. They had tube factories all over the world, from Australia and India to South America, including Amperex in the US and tens of plants all over Europe. I am not sure about Africa, but, given the traditional relations and interests, I wouldn’t be surprised if there were some plants in South Africa, too.
EI in Yugoslavia alone had more than 50 grid winders. You can imagine how many there were in Blackburn, the plant that used to make millions of tubes on weekly basis. No one else had such sophisticated machines for metal parts, all of them were state of the art. Anode presses could make complete stapled anodes, from two separate metal reels, 5.000-10.000 pcs per hour, as well cathode presses for seam cathodes, up to 10.000 per hour. There were also fully automated grid winders, mechanical robots to cut and form the stems, evan assembly was automated, to say nothing about glass and stem machines. All equipment was far ahead of its time.
Everybody knows how big brand Siemens is. However, all Klangfilm amplifiers from the 1960s used vacuum tubes made on Philips machines in the Munich plant, except for a few Gustav Bruckner heater winding machines.
Philips machines found their way even under the iron curtain. Hungarian Tungsram used Philips glass machines and cathode press. EI in the non-allied Yugoslavia run on Philips machines, too.
Etched codes are just a small indicator of the advanced thinking of Philips engineers. The code was printed during sealing process, providing that it last practically forever.
The type f31 is also a GZ34. Base is larger then the f32. Type xf1 is also an EL34.
cheers,
Douglas
cheers,
Douglas
Hi Duncan. You should be kind enough to add that after 1927, Mullard was 100% owned by Philips. Mullard - Wikipedia
"Mullard finally sold all its shares to Philips in 1927. In 1928 the company introduced the first pentode valve to the British market."
This statemement is true. Many Philips valves were produced at their Mullard factory. The Mullard factory produced the Philips Pentode... Wonderful Mullard valves like the GZ37 and GZ34 were in fact Philips innovations. It's a fact, but clever marketing probably neglected to tell the unsuspecting British public that these magical devices were also Dutch... (horror of horrors).
I doubt that many others here have some 1923-1927 Philips-Mullard valves, but they are by definition also Philips. I do have one or two... alas, low values though, quite sad. But they also are considered Philips.
The vast majority of surviving Mullard valves out there are 100% Philips. Made in England to the same exacting standards as in the Netherlands.
Now Mazda... I have some French Mazda's. They're not Philips. Here you are 100% correct. It seems they are somehow related to general electric... I won't comment more.
Osram is (still?) owned by Siemens. So they are definitely not Philips either, but I do have Philips valves that were actually made by Siemens, and Siemens valves that were actually made by Philips.
It seems that this was a common practice to fill certain large purchase orders.
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Hi Sorento
It seems that Mazda also made valves for Philips. When they did that they used a special Philips code. This makes sense, although from what I understand they were not owned by Philips.
In Hamburg, the C.H.F. Müller Röntgenwerk Factory (somehow connected to Wilhelm Röntgen, who passed away in 1923) made Valvo products. They were also owned by Philips from 1927 onwards.
so yes, Valvo is also Philips.
It seems that Mazda also made valves for Philips. When they did that they used a special Philips code. This makes sense, although from what I understand they were not owned by Philips.
In Hamburg, the C.H.F. Müller Röntgenwerk Factory (somehow connected to Wilhelm Röntgen, who passed away in 1923) made Valvo products. They were also owned by Philips from 1927 onwards.
so yes, Valvo is also Philips.
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Hello --I don't know your name so cant reply in the personal sense ---BUT--Mazda --a British not Philips owned introduced Britain,s FIRST indirectly heated Pentode the AC/P in 1930 and yes I have replaced them in very old wirelesses .
Before that Britain,s FIRST indirectly heated screened grid valve -1928 -AC/S .
Britain,s FIRST Triode Hexode -1937-AC/TH1.
Britain,s FIRST Triode Pentode -1933-AC/TP .
Oh and I missed out the WORLD,s FIRST range of low consumption (0.1A) DC mains valves .
And try and beat this ---- the WORLD,s FIRST Double Pentode valve -1933 - QP240 .
How about World,s FIRST magnetically deflected CRT produced in quantity -1936 -9MH.
Also Britain,s FIRST television detector diode -1937-D1 .
Longest recorded valve life -232,592 HOURS -yes hours on by the BBC -1935 to 1961 -AC/P.
Mazda made good valves - UK government depts. bought them.
1930 to 1970 -40 years continuous manufacturing of CRT,s .
I have more world firsts if you want them ?.
The valve that helped to win the Battle of Britain the SP61 - RAF no.=VR65
Although the detector triode was Marconi designed -guess who made it ?---Mazda -Q---1916.
I wouldn't go into Osram.s history too much as I previously posted .
I don't doubt Mullard made good valves I have dealt with them for a long time replaced 1000,s over a lifetime - TDD4-TH4B etc -etc-and Side-contact ones so no problem with that its just real facts that I go by and no I have no problem with the Netherlands where did the Queen go to at the start of WW2 -
How The Dutch Royal Family Was Evacuated To Britain In May 1940 Using The Bank's Armored Car And a Destroyer
Before that Britain,s FIRST indirectly heated screened grid valve -1928 -AC/S .
Britain,s FIRST Triode Hexode -1937-AC/TH1.
Britain,s FIRST Triode Pentode -1933-AC/TP .
Oh and I missed out the WORLD,s FIRST range of low consumption (0.1A) DC mains valves .
And try and beat this ---- the WORLD,s FIRST Double Pentode valve -1933 - QP240 .
How about World,s FIRST magnetically deflected CRT produced in quantity -1936 -9MH.
Also Britain,s FIRST television detector diode -1937-D1 .
Longest recorded valve life -232,592 HOURS -yes hours on by the BBC -1935 to 1961 -AC/P.
Mazda made good valves - UK government depts. bought them.
1930 to 1970 -40 years continuous manufacturing of CRT,s .
I have more world firsts if you want them ?.
The valve that helped to win the Battle of Britain the SP61 - RAF no.=VR65
Although the detector triode was Marconi designed -guess who made it ?---Mazda -Q---1916.
I wouldn't go into Osram.s history too much as I previously posted .
I don't doubt Mullard made good valves I have dealt with them for a long time replaced 1000,s over a lifetime - TDD4-TH4B etc -etc-and Side-contact ones so no problem with that its just real facts that I go by and no I have no problem with the Netherlands where did the Queen go to at the start of WW2 -
How The Dutch Royal Family Was Evacuated To Britain In May 1940 Using The Bank's Armored Car And a Destroyer