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In Reply to: RE: 6L6GC/5881 Tube Advice posted by Roastaman on June 08, 2015 at 21:43:23
I really like the Russian 6p3s-e. Some say that it is the same as the Sovtek 5881. They look the same, sure don't sound the same. Unfortunately Jim McShane is out of stock, so you'll probably have to get them on epay. I'd recommend getting some pre-Gorbachev era tubes if you can. Let them break in before making judgment.
Here's a link to some that show a date of April 75. If that's the date of manufacture of the actual tubes for sale, they should be great. I bought some years ago from the same factory that were mid '70s vintage, and they were really nice. Wish I would have bought a box of a 100 back then, they were really cheap. BTW, no affiliation with the seller.
twystd
Follow Ups:
75 on the tubes but how can you tell the date code? Also aren't 6P3s with the "e" or "ev" suffix the ones to look for?
Just asking because I can't recall. I bought a bunch of these from you some years back when times were not so good.
The Roman numerals before the 75 is the month, IV is 4, so that stands for the fourth month, April, and the 75 denotes 1975. There are other date codes used later such as 1092 which would be the 10th month (Oct.) of 1992. The link I posted was to the 6p3s-e, which is a much better sounding tube than the 6p3s. The 6p3s-e has the coin base, and the 6p3s has the regular octal base.
Are you sure you bought those tubes from me? I don't remember selling many, mostly put them in my bud's guitar amps and ST-70s.
twystd
"Are you sure you bought those tubes from me? I don't remember selling many, mostly put them in my bud's guitar amps and ST-70s."
It was an ST70 (and MK IV) that I got the tubes for. You emailed some mods/upgrades to tune the Dynacos for those tubes but I lost it by the time I got to them. I ended up using them for some time in a Citation V.
Hint...if you can dig back I would appreciate it.
Edits: 06/12/15
The only thing I can think of that is specific to those tubes, is to run them at 21 watts of dissipation. Of course there are many mods for those amps, really too much to get into here. At 21 watts dissipation, they sound very good, and is proven over time that the tubes hold up well. You might have trouble getting them to bias up that high with the stock resistors in the bias supply. I have been able to do it in the amps I've tried them with, but the adjustment was way at the end of travel.
twystd
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