Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Ed_Chambley on October 02, 2014, 02:24:51 pm
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A seller on Reverb, link:
https://reverb.com/item/192921-70-s-rca-ef86-6267-preamp-tubes
Has these RCA tubes from the 70's and the seller says they are made in Russia. I did not know any RCA branded tubes were Russian, especially when stampede England.
Any one know if these are Russian?
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Wow! That is one honest seller!
Look closely at the plate structure of the tube you linked, and where the pins transition through the glass base.
Compare to the known Mullard EF86
(http://www.keith-snook.info/valve-data/Valves%20for%20sale%20pics/Mullard-EF86-long-short.jpg)
And to the known Russian EF86
(http://www.soviet-power.com/pictures/6J32P.jpg)
Also consider the markings on the tube you posted; at the time RCA was using the block-logo, it was almost always red, not the white that was used on that tube. And Mullards always say "Made in Gt. Britain" and not "Made in England". I've come across other Russian tubes with that white print, claiming to be Brimar and with the wrong details to the labels.
I've also had Russian 6P3S (6L6-like) tubes with an RCA label in a box with RCA markings where the tube was labeled "Made in Germany." However, 1) to my knowledge German companies didn't make a 6L6, and 2) the plate structure and style of getter and bulb clearly gave away the tubes I had as being falsely-labeled and boxed Russian tubes (I didn't know the details to look for when I bought them; this was mid-90's timeframe).
The most plausible explanation I heard was that early fake-labeled tubes weren't intended to deceive in order to cash in on the "NOS craze" (because it hadn't happened yet), but were imported prior to the fall of the Soviet Union and were intended to side-step import restrictions. Until the mid-90's there was still a T.V. repair shop in the city I lived, where I could buy all the authentic RCA tubes I wanted for a fraction of what a music store charged for new-production Russian and East European tubes.
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First I noticed the mesh looks as if it were reversed. That is why I asked. I have been collecting some pentode preamp tubes as I a quite low on them. 9 pin mostly. Easy to see side by side.
They make for a nice simple preamp and I am really getting to like their tone in Country styles.
Probably still a good tube even if it is Russian, but I still get most of the NOS still fairly cheap or trade. I think I am going to stop trading as they are not getting any easier to get.
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I just realized I missed mentioning the seam across the top of some tubes. For the Mullard vs. Russian, it's another tell-tale difference for this specific tube type.