1st project salvaged sears receiver iron need good amp schematic

kenben · 17th October 2011, 02:53 AM

I have a sears receiver with a 12ax7 and 6bq5 se it has 295 b+ . after looking around on the net. I am thinking that the OPT are probably smaller than most of the amp I have seen and was wondering if any one has advice on what’s best to build with these parts ? would like to run out put pentode mode. Thank you

TheGimp · 17th October 2011, 03:51 AM

It would be helpful if you could find the original model number and a schematic.

Off the hand, I'd recommend Baby Huey.

EL84 Amp - Baby Huey

It is a long thread, but well worth reading as it is quite educational.

aardvarkash10 · 17th October 2011, 04:32 AM

Single-ended? RH84.

kenben · 17th October 2011, 04:33 AM

I have looked but no luck on finding it. It is a single ended amp with one 12 ax7 ½ for each channel and one 6bq5 for each cannel was going to pull the transformers and make a small power amp doesn’t’ have to be same design that it is just something that sounds good. It’s a receiver so it should have more power than it needs from the power supply just powering a power amp. Thanks for your response Gimp

kenben · 17th October 2011, 04:38 AM

rh84 probable has much bigger OPT would that make a diferance if i just kept the volume down or would i have to change other values
thanks

aardvarkash10 · 17th October 2011, 04:50 AM

the standard opts will be fine - one of the distinctions of the RH is its tolerance of a wide range of opts. Otherwise, just follow the schematic.

kenben · 17th October 2011, 04:57 AM

Thanks I’ll order some parts tomorrow

17th October 2011, 02:53 AM	#1
kenben diyAudio Member Join Date: Nov 2007	1st project salvaged sears receiver iron need good amp schematic I have a sears receiver with a 12ax7 and 6bq5 se it has 295 b+ . after looking around on the net. I am thinking that the OPT are probably smaller than most of the amp I have seen and was wondering if any one has advice on what’s best to build with these parts ? would like to run out put pentode mode. Thank you

17th October 2011, 04:32 AM	#3
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	Single-ended? RH84. __________________ "Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report

17th October 2011, 04:50 AM	#6
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	the standard opts will be fine - one of the distinctions of the RH is its tolerance of a wide range of opts. Otherwise, just follow the schematic. __________________ "Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report

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17th October 2011, 03:51 AM	#2
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	It would be helpful if you could find the original model number and a schematic. Off the hand, I'd recommend Baby Huey. EL84 Amp - Baby Huey It is a long thread, but well worth reading as it is quite educational.

17th October 2011, 04:33 AM	#4
kenben diyAudio Member Join Date: Nov 2007	I have looked but no luck on finding it. It is a single ended amp with one 12 ax7 ½ for each channel and one 6bq5 for each cannel was going to pull the transformers and make a small power amp doesn’t’ have to be same design that it is just something that sounds good. It’s a receiver so it should have more power than it needs from the power supply just powering a power amp. Thanks for your response Gimp

17th October 2011, 04:38 AM	#5
kenben diyAudio Member Join Date: Nov 2007	rh84 probable has much bigger OPT would that make a diferance if i just kept the volume down or would i have to change other values thanks

17th October 2011, 04:57 AM	#7
kenben diyAudio Member Join Date: Nov 2007	Thanks I’ll order some parts tomorrow

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