Notice how these tubes have pointed tips? A characteristic of this era mil spec Soviet 9-pin mini tubes. They mate well with their very well made mil spec sockets. The combination will have positive contact for a long time.
6H8C, 6P14P & 6P14P-EV. Please share your opinion
- Thread starter grindfix
- Start date
Notice how these tubes have pointed tips? A characteristic of this era mil spec Soviet 9-pin mini tubes. They mate well with their very well made mil spec sockets. The combination will have positive contact for a long time.
I bet there is a section on "Buran" that is reserved for tubes.
Notice how these tubes have pointed tips? A characteristic of this era mil spec Soviet 9-pin mini tubes. They mate well with their very well made mil spec sockets. The combination will have positive contact for a long time.
View attachment 2422467
Was it GAZ-69 (older) or UAZ-469? Later was still in production when I left the country in 1993 and I think had some modifications produced for civilian use.
I think, originally they both were modified post-war Willis spin-offs. Good, dependable trucks but if you spend a day in one's tent you will be sore the next day almost like after the good workout. They are ROUGH! I rode in the tent of GAZ-66 for about 2 weeks at 6 hrs a day. You get used to it.
Lavane
Lunatic Member
If I remember right they were military surplus being sold off after the wall came down. I don't know how old they were though. I still wanted one. They can't be to much rougher to ride in than a moddified jeep like mine. When I installed the lifted suspension, I used so called "soft ride" springs. The first couple coils are supposed to be softer than the rest of the spring. But I can't tell the difference.
It's still a rough ride. Nothing like the new Jeeps being used to get groceries.
I find those 6H8C tubes to sound quite nice.
I ran some comparison tests. Please note that I don't have known NOS American-made 6SN7 tubes to compare to. I ran one Tung-Sol reissue sample and one Russian 6H8C through my Hickok 533 for Gm and then, both of those through AF position in the amp and took measurements.
Tung-Sol Reissue
Gm readings 2500 / 2400
Ua 122VDC / 120VDC
Uk 3.62VDC / 3.67VDC
Gain of one section with feedback connected:
Input 0.38VAC peak / Output 0.64VAC peak
Gain of the same section with feedback disconnected:
Input 0.05VAC peak / Output 0.64VAC peak
6H8C (Novosibirsk)
Gm readings 2100 / 2075
Ua 126.7VDC / 125.9VDC
Uk 3.54VDC / 3.57VDC
Gain of one section with feedback connected:
Input 0.38VAC peak / Output 0.64VAC peak
Gain of the same section with feedback disconnected:
Input 0.05VAC peak / Output 0.64VAC peak
So, OLG is identical between both tested tubes. 12.8x amplification factor in this case. I have one RCA 6SN7 somewhere but it's not new. I remember it showed close Gm sections and was drawing close to equal current in the same position in this amp. I'll try to find it and run the same measurements. I don't know if it can be qualified as a new tube to make a fair comparison though.
Those Soviet Jeeps are likely rougher still. No coil springs there - leaf springs, front and rear.If I remember right they were military surplus being sold off after the wall came down. I don't know how old they were though. I still wanted one. They can't be to much rougher to ride in than a moddified jeep like mine. When I installed the lifted suspension, I used so called "soft ride" springs. The first couple coils are supposed to be softer than the rest of the spring. But I can't tell the difference.
It's still a rough ride. Nothing like the new Jeeps being used to get groceries.
The older one, GAZ-69 had a solid front axle tube that connected to the steering knuckle with an oil-filled ball, like Land Cruisers and Land Rovers, I think.
The newer one, UAZ-469 had a solid front axle. Each front wheel had its own gear drive unit connecting axles to hubs. I think Humvee use that design.
Both are very capable designs.
I personally never had a chance to work on neither of those but the tech who works for me had. He served in Afghanistan in the early 1980s. He was a motor tech there and those front axle designs were not part of what he was involved with so some info may not be 100% accurate.
With feedback or OL?
I'm finding out that different 12AX7 tubes show different frequency responses on the scope in the preamp section with NFB. This was a surprise to me. Modified Fisher 400
HennieTalja
New Member
Some people claim the earlier production 6P14P-EV is better than the later ones from 80/90s, is there any truth in this?
I haven't heard this about the 6N14P-EV. To the best of my knowledge, they were all manufactured at the Reflektor plant in Saratov, Russia.
Has anyone ever said that a more available tube is superior to a less available one? I think scarcity must be part of the magic. Maybe I should buy cargo container loads of some dirt cheap tubes so I can start the rumor that they are the ultimate vacuum tube and slowly trickle them out to fund the purchase of a private island somewhere.
About the only NOS Russian tubes that were better are the St Petersburg-made Svetlana output tubes. Their 6550C was much better than any of today's Russian issues, including the Saratov-made 6550. I could run those 6550Cs in the amps that had OEM Tung-Sols (USA) or GEs — similar electrical settings.
I wish that plant had never closed.
Not those. Has to be something stupid common and extremely cheap right now. Buy the entire world supply for 200 bucks, then make up nonsense about how its the most awesome tube to ever tube so I can drive up the prices and earn a fortune. Doesn't matter if its actually anything special, just need to make it scarce and layer on the BS until it attains mythical status.
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I remember them making one amp I tried them on sound a little softer and more relaxed than with Tung Sol reissues. Not saying that Tung Sols are bad, they sound great in VTA SP14.