>200W with 6BG6GA

davorin · 11th March 2010, 09:27 AM

Here is amp for bass guitar with 6x6BG6Ga in output. Nothing special, but works very good with perfect tone.
Ia-0=6x28-30mA, Ia-max=6x100-110mA
Uout is more than 32Veff. (at 4 ohms resistor, and 41Hz) with distortion less than 5%.
I'll like to hear experience how maximum voltage can stand 6BG6GA (only "Sylvania" and "Philips ECG", not other types !!).

davorin · 11th March 2010, 09:31 AM

More pictures:

SY · 11th March 2010, 09:32 AM

I especially like the cooling and the cage. Well done!

davorin · 11th March 2010, 12:48 PM

Heating at idle of output tubes (plate and heater) is more than 210W, and small hum of fans are not problem at stage.

TheGimp · 11th March 2010, 12:50 PM

Nice jog! Are the transformers custom made?

davorin · 11th March 2010, 12:59 PM

Yes, I made them for this project (I have small machine).

LAZAROIU · 02:02 PM

Very interesting and beautiful realization this schematic is an ultimate power in AB2.I have a question, do you think should go instead 6BG6GA tubes, tubes 807 or the Russian G807???
-If you can and can not publish some secret features and course data output transformer (OT)?
-something about the development and what problems you encountered in its realization?

Thanks!

firechief · 11th March 2010, 04:41 PM

I sense dedication here. How long have you been at this project? Also is that a re-cycled chassis? Always good to re-use.

davorin · 11th March 2010, 05:20 PM

Maybe tube 807 (Pa=25W) work fine with Ug2 300-350V, but 6BG6GA wit big anode ("super tube") have Pa~30-35W and work good with Ug2~450V (and 500V!).
Output transformer have cca 30cm2 (5x6,3cm) and 1790/0,50mmCuLack turns(555+340+340+555) at primary, and 4x40 turns at secondary(first 2 windings with 1,60mmCuLack, and second 2 windings with 1,30mmCuLack). Schematic of wire connections can see at schematic).
Chassis is from old 19"-rack (frame), with new top sheet-metal.
I spend 1 week to build amp, plus 3 days for winding transformers and chokes.
Front and back plate make with "Zveckform-card-maker"-program, print at ink-jet printer, cut and than stick with transparent lack-spray.
Generally I have no problem with building amp, because I measure and match tubes before ("Neuberger RPM370" tube metering table), and use new components.

LAZAROIU · 11th March 2010, 06:56 PM

Thanks very much for information.I thincs that using the proposed power tubes can be more than 200W (!!!!), but with 6X807 valve can easily get 170W-200W, but the condition Ug2 = 300V (max) and not exceeding Ua = 720V, even Raa = 2K and bias adjusted corect.Thanks again for information and congratulations for their achievement.

11th March 2010, 09:32 AM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	I especially like the cooling and the cage. Well done! __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

11th March 2010, 01:46 PM	#7
LAZAROIU diyAudio Member Join Date: Nov 2008 Location: 135200	200W with 6BG6GA Very interesting and beautiful realization this schematic is an ultimate power in AB2.I have a question, do you think should go instead 6BG6GA tubes, tubes 807 or the Russian G807??? -If you can and can not publish some secret features and course data output transformer (OT)? -something about the development and what problems you encountered in its realization? Thanks! Last edited by LAZAROIU; 11th March 2010 at 02:02 PM.

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11th March 2010, 12:50 PM	#5
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	Nice jog! Are the transformers custom made?

11th March 2010, 12:59 PM	#6
davorin diyAudio Member Join Date: Aug 2005 Location: Zadar, Croatia	Yes, I made them for this project (I have small machine).

11th March 2010, 04:41 PM	#8
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	I sense dedication here. How long have you been at this project? Also is that a re-cycled chassis? Always good to re-use.

11th March 2010, 05:20 PM	#9
davorin diyAudio Member Join Date: Aug 2005 Location: Zadar, Croatia	Maybe tube 807 (Pa=25W) work fine with Ug2 300-350V, but 6BG6GA wit big anode ("super tube") have Pa~30-35W and work good with Ug2~450V (and 500V!). Output transformer have cca 30cm2 (5x6,3cm) and 1790/0,50mmCuLack turns(555+340+340+555) at primary, and 4x40 turns at secondary(first 2 windings with 1,60mmCuLack, and second 2 windings with 1,30mmCuLack). Schematic of wire connections can see at schematic). Chassis is from old 19"-rack (frame), with new top sheet-metal. I spend 1 week to build amp, plus 3 days for winding transformers and chokes. Front and back plate make with "Zveckform-card-maker"-program, print at ink-jet printer, cut and than stick with transparent lack-spray. Generally I have no problem with building amp, because I measure and match tubes before ("Neuberger RPM370" tube metering table), and use new components.

11th March 2010, 06:56 PM	#10
LAZAROIU diyAudio Member Join Date: Nov 2008 Location: 135200	Thanks very much for information.I thincs that using the proposed power tubes can be more than 200W (!!!!), but with 6X807 valve can easily get 170W-200W, but the condition Ug2 = 300V (max) and not exceeding Ua = 720V, even Raa = 2K and bias adjusted corect.Thanks again for information and congratulations for their achievement.

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