DR 103 clone help

For those building and repairing amps on their own. Learna and share ideas.

DR 103 clone help

Postby bigdaddy60 on Thu Apr 10, 2014 9:33 pm

I have built 2 DR103 clones...and now I need help! The 100 ohm 5w resistor keeps popping. I have 509v out of the rectifier section. Checked everything I can think of. When I do get it to work for a few minutes the volume
out is very low. Any ideas or help would be greatly appreciated. Thanks
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Re: DR 103 clone help

Postby gusfinley on Sat Apr 12, 2014 3:19 am

I don't know much about Hiwatts, but it would take over 220mA though that resistor just to get to 5 watts. It looks like this powers your preamps tubes so, I would say look for a shorted component in the preamp. This might also explain you low power output - your current is being stolen by your preamp and its starving your power amp.

That's my guess anyway...
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Re: DR 103 clone help

Postby PeterS on Sat Apr 12, 2014 11:31 am

If I'm looking at the right schemo, that also supplies the screens, you could have a shorted power tube. Try it with the tubes out.
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