Heathkit AA-1515 schematic needed - Page 2

dgta · 18th March 2013, 10:02 PM

There are no correct replacement bulbs as far as I can find. The part numbers are Heathkit numbers so they are useless. I haven't found any bulbs that match correctly. They are about 60mA @ 10.5V but the closest ones I found are not bright enough. The meter bulbs and selector switch bulbs are all the same.

This is one of the reasons these amps are cheap, you can't replace the bulbs with correct ones. LEDs don't work either, you won't get the right color and the right light dispersion. The filters are a particular shade of blue that combines with the light of the bulbs to give that distinctive green color.

I don't know the years, mid 70s, look through old catalogs online.

Early amps were rated 60W/ch @ 8ohms, later spec was revised to 70W but no changes to the circuit, just the specs.

Don't know if there were any factory assembled ones or not.

knockbill · 18th March 2013, 10:13 PM

Thanks again for taking teh time,,, teh clear Chrismas tree bulb is a nice shade of green, thru teh meter filter,,, I just may look for another of teh same wattage and call it a day,,, I didn't think it was taht powerful,,, It really sounds good...

How are you coming with your's?is it working?

dgta · 18th March 2013, 10:47 PM

Yes working fine thanks.

Check your DC offset, it's not adjustable.

knockbill · 18th March 2013, 11:05 PM

DC offset? You are beyond me, now...

knockbill · 20th March 2013, 02:55 PM

Quote:

Originally Posted by knockbill

DC offset? You are beyond me, now...

Ok,, I found the sticky...

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18th March 2013, 10:02 PM	#11
dgta diyAudio Member Join Date: May 2011	There are no correct replacement bulbs as far as I can find. The part numbers are Heathkit numbers so they are useless. I haven't found any bulbs that match correctly. They are about 60mA @ 10.5V but the closest ones I found are not bright enough. The meter bulbs and selector switch bulbs are all the same. This is one of the reasons these amps are cheap, you can't replace the bulbs with correct ones. LEDs don't work either, you won't get the right color and the right light dispersion. The filters are a particular shade of blue that combines with the light of the bulbs to give that distinctive green color. I don't know the years, mid 70s, look through old catalogs online. Early amps were rated 60W/ch @ 8ohms, later spec was revised to 70W but no changes to the circuit, just the specs. Don't know if there were any factory assembled ones or not.

18th March 2013, 10:13 PM	#12
knockbill diyAudio Member Join Date: Feb 2013 Location: SE PA	Thanks again for taking teh time,,, teh clear Chrismas tree bulb is a nice shade of green, thru teh meter filter,,, I just may look for another of teh same wattage and call it a day,,, I didn't think it was taht powerful,,, It really sounds good... How are you coming with your's?is it working?

18th March 2013, 10:47 PM	#13
dgta diyAudio Member Join Date: May 2011	Yes working fine thanks. Check your DC offset, it's not adjustable.

18th March 2013, 11:05 PM	#14
knockbill diyAudio Member Join Date: Feb 2013 Location: SE PA	DC offset? You are beyond me, now...