Tube DIY Asylum

My AC must be more than 118

66.91.168.87

DAK

A

In Reply to: RE: Using a CL inrush current limiter to lower B+ posted by Tre' on August 29, 2017 at 15:45:12

Although i check it periodically, it could be higher nowadays. I soldered two CL90 right after the AC input from the IEC socket to each leg of the PT primaries and that actually made a big difference. The B+ after the filters, is now 460vdc. This is only 20 vdc more than i want but i might just leave it at that. Plate voltage is now 440 and G2 voltage is 420.
For single ended pentode, is this too much for KT88, KT90 , and KT120?

Follow Ups:

RE: My AC must be more than 118 - Triode_Kingdom 21:09:17 08/29/17 (2)
Using resistors to drop B+ to the output stage will ruin the regulation of the supply. This is OK for temporary test purposes, but it will turn a good amp into junk.

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Buy Chinese. Bury freedom.
- i am not using any dropping resistors in the B+ - DAK 23:04:42 08/29/17 (1)
  My Power Supply is LCLC. Then there is a 3.3K dropping resistor for the G2 voltage and then another 33K for the B+2.
  So as it stands now, i have 460vdc with 6550A power tubes. I am trying to get to 440vdc. I have a suspicion that with the kt120 power tubes the B+ will be around 440 volts. Do you think 410 volts on G2 is too high?
  - RE: i am not using any dropping resistors in the B+ - Triode_Kingdom 06:34:01 08/30/17 (0)
    Adding resistance on either side of the transformer degrades regulation. This is the wrong way to accomplish the drop.
    About G2, I haven't used the KT120. Someone like Jim McShane might be able to advise you regarding the practical aspects of this tube.
    
    --------------------------
    Buy Chinese. Bury freedom.
    
    Edits: 08/30/17

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