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02-12-2024, 12:15 PM
Hi Guys
As the VCK notes say, you have to measure the voltages on the amp at the normal idle condition. For a conventional cathode-biased amp, this is more or less the same as the full output condition. In this amp with its power control, the power must be set for full voltage so the output tubes idle as hot as they are supposed to.
VCK is clamped internally to a 200V maximum voltage difference between input and output to protect the devices onboard. This is more this the usual regulation voltage swing found in most amps. The VHT 1220 has a hi/lo voltage/power setting, so adjustment of VCK may be a little trickier and it may end up optimised for one switch position over the other - installer's choice.
When stuffing VCK, the first transistor you install should be the BC, then install the A92, then the A42/3.
As the VCK notes say, you have to measure the voltages on the amp at the normal idle condition. For a conventional cathode-biased amp, this is more or less the same as the full output condition. In this amp with its power control, the power must be set for full voltage so the output tubes idle as hot as they are supposed to.
VCK is clamped internally to a 200V maximum voltage difference between input and output to protect the devices onboard. This is more this the usual regulation voltage swing found in most amps. The VHT 1220 has a hi/lo voltage/power setting, so adjustment of VCK may be a little trickier and it may end up optimised for one switch position over the other - installer's choice.
When stuffing VCK, the first transistor you install should be the BC, then install the A92, then the A42/3.
