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Orange bass terror HT voltage


mikeydee
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I bought an old OBT pre amp board from obbm to create a little pre amp module. I have it working fine with the input ht set to 240vdc giving a plate voltage of about 140 on v1a.

I would be keen to hear from any one that knows what the ht should actually be. And, if anyone has a schematic that would also be very welcome.

Mike

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Yes I was expecting something in the range of 150-250 volts.

The 175v is what is supplied to the HV connector on the input board. There are a couple of 10k dropper resistors one for V2 and a further one for V1 so the plate voltage on V1 is reduced a fair bit once biased up.

I'll post measurements if folks are interested.

See you are in Bristol too - so a local Hi to Subthumper.

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