Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes... - diyAudio
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Old 23rd November 2010, 03:39 PM   #1
chops is offline chops  United States
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Thumbs up Excellent NOS Russian 6Pi3C/6N3C (6L6GC) Tubes...

I just got in my matched quad of NOS Russian output tubes for my Baldwin amp yesterday. The main reason for buying these tubes was just to get an inexpensive quad of output tubes to diagnose a slight noise issue with my amp that was being put through the speakers. The noise wasn't loud, but it was quite annoying none the less. I wasn't sure if it might have been the output tubes (as I already swapped the preamp and rectifier tubes) and still had the noise. I was starting to wonder if it might have been the 50+ year old coupling and/or bypass caps. After replacing the Chinese Shuguang 6L6GC's with these Russian 6Pi3C's, the speakers are absolutely dead silent. No hum, hiss, crackle, sizzle, pop, tick... Nothing. So apparently it was the 6L6's causing the problem.

I put the 6Pi3C's in and had them running for approximately 2 hours last night before heading to bed, and I have had them running since 7am this morning. So far, these tubes sound great!

Mind you, I'm not ranting and raving over them, but these tubes sure do sound extremely good for the money. They still have the impact and massive bass control of the 6L6's driving my NHT 2.9's, and they still have that smooth, extended top end of the 6L6's, but what they add into the mix is the warm, full glowing sound in the midrange, much like a EL34/6BQ5 or SE amp. It's the best of both worlds.

Of course, YMMV considering the amp(s) you use these Russian tubes in, but I do urge you to try them out in your setup. I'm sure you won't be disappointed. And at their price point on eBay, you can't go wrong. I paid about 20 bucks more for mine than most of the listings on eBay only because I wanted them ASAP and the NOS ones I found were in California, not in Russia, Ukraine, etc, etc.

Please don't listen to the people who say these tubes are junk and don't sound good. My NHT's are quite detailed and respond very well to differences in the signal chain, both good and bad.

Here's a couple iPhone pics of them, one at night and one during the day. As you can see, they also have that blue glow to them...

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Old 23rd November 2010, 04:20 PM   #2
TheGimp is offline TheGimp  United States
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Shhhhhhhh! I haven't bought mine yet.

I see your are running the 6N3C and not the 6N3C-E. good to know they work well.

What are your Plate and Screen voltages?
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Old 23rd November 2010, 05:04 PM   #3
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Quote:
I see your are running the 6N3C and not the 6N3C-E. good to know they work well.
The correct "translation" from Cyrilic letters is 6p3s and 6p3s-e.
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Old 23rd November 2010, 05:28 PM   #4
chops is offline chops  United States
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Quote:
Originally Posted by TheGimp View Post

What are your Plate and Screen voltages?
Unfortunately, I haven't a clue what any of the voltages are in this amp. All I know is that it's wired for fixed bias.


Also, totally off subject, but what's going on with the forum? Everything is looking funky today.
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Old 23rd November 2010, 06:05 PM   #5
athos56 is offline athos56  United States
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I noticed that as well....
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Old 23rd November 2010, 06:26 PM   #6
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Those " Gremlins " are reminding us what an excellent job they do for us in the background.
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Old 23rd November 2010, 06:42 PM   #7
chops is offline chops  United States
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I just went to AudiogoN and found one of Will Vincent's amps for sale (a modded Dynaco ST-70) and sent him an email regarding the technical specs of this Baldwin amp. I hope he replies back soon. I too would like to know what the different voltages are in this amp.

On another note, I'm still listening to this amp and boy do these new tubes sound good!

Speaking of tubes, I asked him a question which is probably a stupid one and am almost afraid to ask here, but I asked him if this amp is capable of running EL34 tubes. I have read that some amps can swap between 6L6's and EL34's all day long, but I think it might have something to do with the actual design and/or power supply transformer. I just figured I'd ask anyway.
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Old 23rd November 2010, 06:52 PM   #8
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At EL34 the supressor is connected to pin 1. At 6p3s pin 1 is not used. Therefore you should connect pin 1 and pin 8 together ( at the tube sockets).

However, the bias of EL34 and 6s3p are obviously quite different, so this should be adjusted.
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Old 23rd November 2010, 07:57 PM   #9
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I found that 6P3S sounds detail, but agressive in penthode mode.
Try, please, use it in triod or UL mode. 6P3S-E is better, IMO.
6P3S is ,IMO, for guitar amplifiers.
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Old 23rd November 2010, 08:16 PM   #10
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I found that 6P3S (6П3С originally) are fair copies of RCA 6L6G, but they are NOS and sometimes gassy; also they are Russian so have spread of parameters wider than barn gates.

I still have some left. I want to try and bake it at 150 degrees C in an oven, let's see if it reduces gases.
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