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. __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

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. __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

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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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