HT-5R Combo: How to reveal the circuit board??

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darkestwinter
Posts: 6
Joined: Mon Feb 18, 2013 6:32 am

Sun Mar 05, 2017 3:46 pm

So my HT-5R combo suddenly stopped working. At first I thought it's the tubes but after a quick research the issue seems to be with the R38/39 resistors.
I'd like to check the circuit board but I can't figure out how to reveal it, as the top wooden part of the amp appears to be glued to the chassis.
Any help would be appreciated.

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Uffingdon
Posts: 45
Joined: Wed May 04, 2011 12:00 am
Location: Far Side Of Nowhere

Sun Mar 05, 2017 4:54 pm

Have you tried removing the little black screws on the back panel, they maybe what's holding the chassis to the panel?

darkestwinter
Posts: 6
Joined: Mon Feb 18, 2013 6:32 am

Sun Mar 05, 2017 8:06 pm

I tried removing them now but as I suspected these screws are too short and their sole purpose is to support the metallic diagram of the inputs/outputs.

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thephantum
Posts: 1160
Joined: Wed Jan 29, 2014 7:42 pm
Location: Virginia, United States

Mon Mar 06, 2017 1:00 am

If you've removed the four machine screws holding the chassis to the panel, they are just stuck together. They will come apart. It just takes some patience and some prying.

zoziano
Posts: 6
Joined: Fri Oct 12, 2018 1:29 pm

Fri Oct 12, 2018 2:44 pm

In this case, if i have to change the power tube with an other one different from stock one, where i have to control the mV values in order to bias it?? Only between cathode R33 and ground (Plate)?

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