Setting bias on HT Club 40 MkII

HT-1R MkII, HT-5R MkII and HT-20R MkII Head and Combos.
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cnumb262
Posts: 2
Joined: Sat Oct 12, 2019 9:12 pm

Mon Oct 21, 2019 4:02 am

I have had this amp for a few weeks and it sounds great. I want to try some different EL34 tubes to see how they sound. I am very used to biasing Marshalls and similar amps, but can't quite understand the MkII.

I dropped the chassis down and looked for a bias pot, but there are none mounted on the board. As I was putting the chassis back in I noticed some cutouts with the adjustment screws and leds next to the power tubes. The leds are green and red, with the green ones shining right now. There is also a 3 prong connector next to the leds. All of this seems like the bias on the MkII can be set without dropping the chassis - which is a great feature. Unfortunately, I can't find any documentation on adjustment screws or the connector.

Any instructions will be appreciated.

Thanks, in advance

*** I meant to add that
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