Heathkit Schematic model AA-50 needed

Sir Trefor · 8th June 2007, 08:54 PM

I took this amp apart and carefully made a schematic as I went, and now i've lost the schematic. I cannot find this anywhere on the web. I tried to connect it from memory to no avail.

Specifically I need the schematic for the PSU; it has a 5AR4 rectifier along with 5 caps(60, 25, 40, 40, 20 [500V]). There is a 10w 1.5 kOhm wirewound resistor connected to pin 8 of the rectifier- I had connected this to the (+)terminal of the 60uF cap along with the centre-tap lines from the OPTs- assuming this was my positve volatge- am I incorrect?

Eli Duttman · 8th June 2007, 11:08 PM

Try pinging Tom Bavis. IIRC, he has the AA-50 schematic.

Tom Bavis · 9th June 2007, 12:30 AM

You rang?

I'm afraid I don't have that one... but it's one of the few Heathkits that was covered in Sams Photofacts... folder 544-7 to be exact. Check with your local library...

Sir Trefor · 9th June 2007, 12:35 AM

Thanks for the help, guys

Sir Trefor · 9th June 2007, 01:05 AM

Their website appears to be down... I'm assuming that the 'check my local library' comment was facetious? Or might the Fresno, California Public Library have information I can use?

Victoria · 9th June 2007, 01:51 AM

No he is not being facetious!!! Library used to have (and still may)
have tons of Sams. I have gotten 2 from my library in the bay area in the last 1 1/2 years. Victoria

8th June 2007, 08:54 PM	#1
Sir Trefor diyAudio Member Join Date: Sep 2004 Location: somewhere in California	Heathkit Schematic model AA-50 needed I took this amp apart and carefully made a schematic as I went, and now i've lost the schematic. I cannot find this anywhere on the web. I tried to connect it from memory to no avail. Specifically I need the schematic for the PSU; it has a 5AR4 rectifier along with 5 caps(60, 25, 40, 40, 20 [500V]). There is a 10w 1.5 kOhm wirewound resistor connected to pin 8 of the rectifier- I had connected this to the (+)terminal of the 60uF cap along with the centre-tap lines from the OPTs- assuming this was my positve volatge- am I incorrect? __________________ "This is just my 'one cent'; I haven't got two to give."

8th June 2007, 11:08 PM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Try pinging Tom Bavis. IIRC, he has the AA-50 schematic. __________________ Eli D.

9th June 2007, 12:35 AM	#4
Sir Trefor diyAudio Member Join Date: Sep 2004 Location: somewhere in California	Thanks for the help, guys __________________ "This is just my 'one cent'; I haven't got two to give."

9th June 2007, 01:05 AM	#5
Sir Trefor diyAudio Member Join Date: Sep 2004 Location: somewhere in California	Their website appears to be down... I'm assuming that the 'check my local library' comment was facetious? Or might the Fresno, California Public Library have information I can use? __________________ "This is just my 'one cent'; I haven't got two to give."

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9th June 2007, 12:30 AM	#3
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	You rang? I'm afraid I don't have that one... but it's one of the few Heathkits that was covered in Sams Photofacts... folder 544-7 to be exact. Check with your local library...

9th June 2007, 01:51 AM	#6
Victoria diyAudio Member Join Date: Jan 2006 Location: SF Bay area	No he is not being facetious!!! Library used to have (and still may) have tons of Sams. I have gotten 2 from my library in the bay area in the last 1 1/2 years. Victoria

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