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 Post subject: Re: Cold startup B+ surging too high
PostPosted: Sep Mon 03, 2018 2:54 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8846
Location: Beaver Falls, PA. USA
On an old Allen organ amplifier, the output transformer shorted primary to secondary, which shorted the B+ and blew the fuse. I never saw that one before.

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 Post subject: Re: Cold startup B+ surging too high
PostPosted: Sep Mon 03, 2018 3:10 pm 
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Joined: May Sun 13, 2012 8:12 pm
Posts: 12173
Location: Central PA 16801
neither have i.

that's a different failue.

i wonlder if there was a mfgr defect iin it since wind one ?

steve

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 Post subject: Re: Cold startup B+ surging too high
PostPosted: Sep Thu 20, 2018 12:18 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 302
Location: Windsor, CT USA
I use thermistors (CL-90 for mono amps and CL-80 for stereo) to reduce B+ inrush voltage. I put a thermistor in series with the AC line. I usually insert them at the connection to the fuse holder. Thermistors get hot and need ventilation, so I always position them above the chassis. They work great at startup, and help extend tube life.


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