I am looking to upgrade the power transformer in my S-5 Electronics K16ls kit amp but I have done away with the ss rectifier and replaced it with 2 paralled 6BY5GA tubes. The amp uses 8x 6005 tubes in ppp and 2x 5670 tubes. The info I got from S-5 about the stock power transformer is 120v primary, 180v secondary (actually measures around 200VAC) @ 250mA, 6v secondary @ 5.5A. I would like to find a power transformer that has slightly higher HV to account for the voltage drop across the rectifier tubes but I have had no luck finding something that will supply 225-230V @ 250-300mA. I don't want to go any higher on the HV and cook the 6005s. Any ideas would be greatly appreciated.
GE Data sheet gives a recommended operating point at 250V plate and G2, -15V G1, 70mA for a pair of tubes AB1 PP.
If the kit runs cathode bias, you can subtract the magnitude of the G1 voltage from the plate voltage.
You also drop a few volts across the OPT, so a B+ of 265-275 is reasonable.
If the kit runs cathode bias, you can subtract the magnitude of the G1 voltage from the plate voltage.
You also drop a few volts across the OPT, so a B+ of 265-275 is reasonable.
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