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Old 14th October 2012, 09:16 AM   #61
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Progress photo

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Old 24th October 2012, 10:12 AM   #62
tcqanh is offline tcqanh  Viet Nam
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Does anyone take comparision on the sound of C3g between triode connection and penthode strap ?

my friend just finished his C3g-6B4G SE ampli. He said to me that C3g in triode with G3 connect to anode get better sound than G3 connect to kathode, sound become sweeter and more dynamic. He asked me why, but I cannot explain it. Has anyone got this experience ?
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Old 24th October 2012, 11:17 AM   #63
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tcqanh,

Have you read build log to which I attached link in post 48?
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Old 5th January 2013, 03:27 PM   #64
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Input switch done and tested. Now it is time to connect and fire the amp.

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Old 5th January 2013, 03:29 PM   #65
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Old 5th January 2013, 04:05 PM   #66
djn is offline djn  United States
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That is a beautiful amp and I really LOVE those meters. Where can I get a pair of them???
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Old 5th January 2013, 04:16 PM   #67
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Quote:
Originally Posted by djn View Post
That is a beautiful amp and I really LOVE those meters. Where can I get a pair of them???
Those are USSR NOS stock one can find on same flea markets in Poland. And golden rings comes from Ikea.

Thanks for your kind words about the amp.

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Old 7th January 2013, 05:34 PM   #68
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Unhappy C3g is dead. Time for E180F

One C3g is dead. Why have I not tested it before? No spare item. Bad luck. I have EF861 (E180F) or 6c45pi. Will use pentode strapped pentode.
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Old 7th January 2013, 11:42 PM   #69
tcqanh is offline tcqanh  Viet Nam
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Quote:
Originally Posted by yagoolar View Post
One C3g is dead. Why have I not tested it before? No spare item. Bad luck. I have EF861 (E180F) or 6c45pi. Will use pentode strapped pentode.


1 Tube C3G Siemens Post Rohre | eBay

You can consider 4P1L with the same socket to C3g. This tube has low gain, so you need more 1 stage at input.
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Old 8th January 2013, 04:43 AM   #70
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Originally Posted by tcqanh View Post


1 Tube C3G Siemens Post Rohre | eBay

You can consider 4P1L with the same socket to C3g. This tube has low gain, so you need more 1 stage at input.
I bought mine for $3.00 a piece. They were used yet matched. After I had looked through ebay.com I decided not spend this much money on C3g. I have EF861 by hand (E180F equiv), which is also a good tube for the project. Less aesthetically pleasing, but E180F or 6Ж9 are easily available in Poland, prices starting from $1.50.
3-stage amp is a different project. 4п1л has too low μ as triode, so I'd rather keep it for output or driver tube in future projects.
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