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Post subject: Re: Hotrod Deluxe noise & blown caps
Posted: Wed Mar 11, 2015 9:19 am
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Joined: Thu Aug 07, 2014 3:25 pm
Posts: 1023
Ok , now we're gettin' somewhere.
The white wire should measure 220 ohms, so its likely that the tank was also hooked up backwards to start with.
I find that the 220 ohm return coil has more failures. It's smaller guage wire and is more prone to breaking.
Measure the coils at the tank to confirm its not the RCA cable before you order another tank.
The red wire should go to the tank connector marked input.


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Post subject: Re: Hotrod Deluxe noise & blown caps
Posted: Thu Mar 12, 2015 6:51 am
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Joined: Thu Dec 01, 2011 4:22 pm
Posts: 20
Location: Central Ohio
When I measured the tank at the connectors, I took readings from both the RCA connectors and flipped the tank upside down and placed my probes on the terminals to be sure I was making contact. I then put the probes on the little 2-pin connector contacts right at the coil and had the same readings all the way around. I did check continuity of the wires, measuring from the PCB connections to the tip/ring of the RCA connectors and the wires are good. So, looks like we've definitely found the problem!

I have a tank in my '68 DR, but it's input impedance is 8Ω, while the tank on the HRD is 600Ω, so I can't try that. A replacement Accutronics tank for the HRD is only about $33 shipped, so it's an inexpensive fix.

Thank you so much for all your help! Happy to not only give this amp it's life back, but make it better than it was before by replacing all those cheap caps!

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jt burke
Marion, OH


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