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Old 1st November 2013, 04:43 PM   #1
Ryssen is offline Ryssen  Sweden
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Default 3 questions about 6B4g

1:The Sovtek 6B4g how many hours will it last if operated with 250v 60mA?
2:How long is the breakin time?
3:Any one tried these:Matched pair 6S4S (6B4G) Russian Audiophile Triode Tubes Svetlana 1960's | eBay

How are they soundwise?
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Old 1st November 2013, 05:38 PM   #2
TheGimp is offline TheGimp  United States
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Data sheet specifies greater than 1000Hrs.

I've not listened to any yet.
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Old 1st November 2013, 05:52 PM   #3
Bigun is offline Bigun  Canada
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You need to break-in these valves as some of them have been sitting around a long time - you want to avoid arcing inside until they are cleaned up. I can't remember the best way to to that - run the heater without full anode voltage is probably the answer.

Data sheet lifetime, according to Wavebourn, is always overly pessimistic for Russian valves.

I've heard the 6C4C through a large Hammond trafo and it sounded good to my ears.
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Old 1st November 2013, 05:59 PM   #4
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I think the Svetlana ones are the same as I have ( link doesn't work for some reason ) in which case -
They are good sound quality for the money ; and they will take a bit more dissipation and voltage than an typical NOS 6B4G - say 300V anode-cathode and 65mA .

On the other hand they sound a bit lacking in class and finesse, especially in the treble ( HF ) when compared to tubes like this ( Sylvania ) :
Frag Jan zuerst- Ask Jan first: Roehren und mehr

which I also own . These are very good value at E100/pr.
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Old 1st November 2013, 09:16 PM   #5
multi is offline multi  Australia
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Has any one used the Sovtek Large 2A3 or 6b4g?
What voltage?
Current ?
Phil
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Old 1st November 2013, 09:32 PM   #6
45 is offline 45  Italy
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Quote:
Originally Posted by Ryssen View Post
1:The Sovtek 6B4g how many hours will it last if operated with 250v 60mA?
2:How long is the breakin time?
3:Any one tried these:Matched pair 6S4S (6B4G) Russian Audiophile Triode Tubes Svetlana 1960's | eBay

How are they soundwise?
The Sovtek 6B4G is a different design in comparison to NOS devices. It's more like a down-graded 300B but it is not really a compliment from my perspective.....
Two little "sampling" for really telling sensible numbers.

The 6S4S instead is a REAL 6B4G/6A3 and it is actually better than American types, IMHO. It can take up to 360V plate voltage and it works flawlessly at 18W plate dissipation too. You can expect reduced life at more than 15W plate dissipation but it will be more than 5000 h easily!
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Old 1st November 2013, 11:53 PM   #7
multi is offline multi  Australia
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Could not get the New Sovtek 2A3's to bias up correctly in a circuit that works with RCA 2A3's.
Do they have very different characteristics?
Mine when tested as a 2A3 read 25mills and 3ma /volt.
Phil
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Old 2nd November 2013, 07:39 PM   #8
Fuling is offline Fuling  Sweden
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1: Virtually forever, my pair has been playing for <10 years now without any signs of degradation and I´ve been running them at something like 290V 60mA for the last couple of years.

2: Don´t know.

3: I bought a pair of russian 6S4S years ago as a future replacement for my Sovteks, they are still in their boxes as I haven´t had a reason to try them yet.
Probably fine triodes.
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Old 2nd November 2013, 08:20 PM   #9
Ryssen is offline Ryssen  Sweden
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Tanks for the answers so far..
5000h-->10years thats what I wanted to hear..
I have 2 pairs of Sovteks and one pair of Sylvania,they should last a while then.
Running one of the Sovtek pair in my monkey amp,Been running for about 15 hours
and I did run the heaters alone for about 10 hours.
I think they are detailed but maybe a little hard sounding wich I hope will get better in time.
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