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I? could? also? wire a small? 250 vac? rated MOV? across relay? contacts. Jim? VE7RF

25k? uf? ?cap? is? only? charged up? to? 12? vdc...? = lousy 1.8? joules.? ? Cap? in parallel? with? 12 vdc? coil. Relay? contacts? wired? across? the? drop? resistor? to?

How much relay pitting would you get at 25,000 uf ? A little more complicated, but a 555 timer with a adjustment knob might let you experiment a little more with hang time. Don W4DNR Quoting Jim VE7RF

<Don Roden Feb 26 #37161 ( /g/ham-amplifiers/message/37161 ) <Slow delay also equals slow pickup unless you add another relay contact. <Don W4DNR ##? I? had? thought? of? that

< Joe WB9SBD Feb 26 #37160 ( /g/ham-amplifiers/message/37160 ) < Wouldn't just the inertia of the blower itself provide almost the same delays you are desiring? ##? I? thought?

Slow delay also equals slow pickup unless you add another relay contact.?Don W4DNR

Wouldn't just the inertia of the blower itself provide almost the same delays you are desiring? Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com

I'm? going? to? use a? resistor to? slow? down a blower....on? RX.? ? ?Resistor? shunted? on? TX.....? with a DPST - NO Kilovac vac? relay.? (contacts in? parallel). (12? vdc?

Thought I'd let all you guys, 25 replies I received with advice, what a great group of folks you all are! Anyway, I hooked up KN4UNA's AL-1200 amp he received from his uncle's estate, W4WWF Rober

Good? point.? All? my? 1/2? dozen? opto? ssr's? are? 200 Vdc? @? 1A......(ODC-3A).? ? ?The? ODC-3 is? rated? at? 60? dvc? @? 3A? ccs.? (both? have? 4 kv? AC? isolation).?

I use the red Opto 22 SSR in my YC156 and a friend is using it in a GS35B amp to switch around the cut off resistor. I got a truck load of them for nothing, years ago, so I thought I might as well use

Page 76? ?in? the? 2020? MFJ? catalog. A. 408-8100, $19.95.? ? Kilovac S05FJA238, DPST-NO, contact form 2A.? 5kV rating between contacts, current is 10A DC or 5A RF, 12 VDC coil voltage and

I? bought? the? Vishay? resistors? at? Mouser. Jim? VE7RF

<Carl Feb 15 #37150 ( /g/ham-amplifiers/message/37150 ) <BUT only 85C rated, that could be rough when using a high ripple doubler HV PS. ##? 120? hz? ripple? current? into?

Thanks for that info, I'll order some and run them as a 500V cap with some safety margin. Carl

Derated for 105C = 600 X .91 = 546V Voltage derating (0.91VR) enables 105°C operation BUT only 85C rated, that could be rough when using a high ripple doubler HV PS.

BUT only 85C rated, that could be rough when using a high ripple doubler HV PS.

Assuming that the amp is functional, are you sure you that you don’t have it in standby or that it is being keyed properly by the radio. You don’t need ALC when then amp is driven with almost any

For those who might be building or considering a HV power supply, Newark currently has a promotional price on 600V 270uF caps that appears to be a bargain.

I recently acquired a Tokyo Hypower HL-45B in excellent cosmetic condition. I do not have a Yaesu FT817 and attempted to drive the amp with another qrp rig @ 5 watts with no alc cable between the amp