Russian Military spec 6L6?

wabash slim

I Bleed Orange
Feb 10, 2010
19,479
lafayette in
For the longest time, the Soviets continued to use tubes in military vehicles and aircraft as a safety precaution -vacuum tubes are immune / resistant to EMP blasts caused by nuclear explosions.
Same reasoning to keeping vehicles' ignition systems old school with points and plugs.

Of course, the Russians also experimented with steam powered aircraft and flying tanks.
 

Ricochet

Senior Gretsch-Talker
Gold Supporting Member
Nov 13, 2009
23,194
Monkey Island
I have not tried the Russian 6l6 variant but I do have a lifetime supply of 6n14p that are old stock Russian tubes in the EL84 vein. Love them great harmonic content but some of them, all had been tested as good by a good tech, have more ambient noise when idle than others. Once you hit a note that noise in not noticed. Sorry I can’t help with this 6l6 type. Oddly I bought these el84 variants because I got them dirt cheap and decided to try a couple then liked them so bought him out. If the price is right you could try a set and have a tech try to bias them.

Same here, I think I was looking at the cheapest JJs for $15 and these were $8 bucks straight from Moskou. No brainer.

I’d take NOS Rusky over Modern production.
 

juks

Country Gent
Gold Supporting Member
Nov 26, 2020
3,681
Fremont, California
Yeah, considering that they're one of the few places still making tubes.
Are tubes susceptible to EMF pulses?

I think somebody said no. But I'd think that any equipment these days has electronics too even if tubes are included. Hence they'd shut down even if tubes are fine.

China makes tubes too and one eastern European country. Czech Republic maybe?
 

LesB3

Synchromatic
Silver Member
Aug 17, 2021
508
Philadelphia, PA
Yeah, considering that they're one of the few places still making tubes.
Are tubes susceptible to EMF pulses?
EMF?


I think somebody said no. But I'd think that any equipment these days has electronics too even if tubes are included. Hence they'd shut down even if tubes are fine.
EMP affects certain electronics, not all. Semiconductors are particularly susceptible, so are things like radios that receieve any kind of RF signal. Just a bit of shielding can sometimes help.
 

hcsterg

Friend of Fred
Silver Member
Feb 13, 2012
7,061
France

Sorry to be late to the party... ;)

I had a look to @cowmoo 's pictures.

- The 1st series of tubes are well known here in France and were sold under different brands like RSD, Tronal, Zaerix... These are GT tubes (Glass Tubular), and the specs are usually rather in-between the 6L6G (coke bottle) and the 6L6GC (heavy duty ones, large glass tubular), even if some are labelled GC (RSD). These tubes are excellent sounding when pushed, due to their relative low degree of vacuum, but therefore their life duration is not the longest, and they tend to become microphonic (vibration sensitive) due to their construction. That's why I say they are "in-between", but there's exceptions...

1675182975326.png 1675183038854.png

The official plate dissipations - according to types - were as follow :
6L6M, 6L6G = 19W
6L6WGB/5881 Tung Sol = 22W
6L6GC RCA/GE = 30W

The rest of the characteristics are identical, following the basic class A operation data at : Vp=250V / Vscr=250V / Ip=72mA / Iscr=6mA / Vg=-13.5V

Note that you can put a GC type in lieu of a G, but usually not conversely, because you may burn the G type quickly (red plating) from excessive plate dissipation.

- The second series of tube are identical (even the boxes) to a NOS sextet that a friend brought me back from Russia year ago, but I never tested nor measured them, sorry... They have one little inconvenience though - at least for guitar amps : they are not anchored by the classic Fender clip retainers (no possible grip on the glass), you have to change them to a spring retainer à la Marshall (by the top)...

1675182898387.png

Both have been produced later by SovTek ( = Mike Matthews / EHX) and are possibly still available today...

A+!
 


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