6550 SE CCS VR tube screen shunt reg debugging

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Hi Gang,

The VR tubes light up no problem (CCS set up for 25ma with screen drawing 5ma) from cold start and are stable. Rectifiers are slow turn-on type.

There's an issue on "hot start" (i.e., turn off and turn on within may be 1 minute). The VRs would flicker and motorboat, and cause the speaker woofers to pump. Sometimes it will stabilize, other times it will continue to oscillate. Is this a cap charge-discharge issue because the screen is drawing too much current on hot-start? Is there a circuit mod to prevent this issue?

TIA

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Topic - 6550 SE CCS VR tube screen shunt reg debugging - Single_Ended 21:01:55 05/09/17 (2)

RE: 6550 SE CCS VR tube screen shunt reg debugging - PakProtector 13:38:50 05/10/17 (0)

RE: 6550 SE CCS VR tube screen shunt reg debugging - Triode_Kingdom 21:08:37 05/09/17 (0)

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