yagoolar's tube amp projects - Page 7

yagoolar · 14th October 2012, 09:16 AM

Progress photo

tcqanh · 24th October 2012, 10:12 AM

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 ?

yagoolar · 24th October 2012, 11:17 AM

tcqanh,

Have you read build log to which I attached link in post 48?

yagoolar · 5th January 2013, 03:27 PM

Input switch done and tested. Now it is time to connect and fire the amp.

yagoolar · 5th January 2013, 03:29 PM

djn · 5th January 2013, 04:05 PM

That is a beautiful amp and I really LOVE those meters. Where can I get a pair of them???

yagoolar · 04:24 PM

Quote:

Originally Posted by djn

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.

yagoolar · 7th January 2013, 05:34 PM

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.

tcqanh · 7th January 2013, 11:42 PM

Quote:

Originally Posted by yagoolar

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.

yagoolar · 8th January 2013, 04:43 AM

Quote:

Originally Posted by tcqanh

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.

5th January 2013, 04:05 PM	#66
djn diyAudio Member Join Date: Oct 2004 Location: Waterford Michigan	That is a beautiful amp and I really LOVE those meters. Where can I get a pair of them??? __________________ My "Art" website http://home.comcast.net/~djnagle/site/

7th January 2013, 05:34 PM	#68
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	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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14th October 2012, 09:16 AM	#61
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	Progress photo

24th October 2012, 10:12 AM	#62
tcqanh diyAudio Member Join Date: Apr 2011 Location: HoChiMinh city	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 ?

24th October 2012, 11:17 AM	#63
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	tcqanh, Have you read build log to which I attached link in post 48?

5th January 2013, 03:27 PM	#64
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	Input switch done and tested. Now it is time to connect and fire the amp.

5th January 2013, 03:29 PM	#65
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw