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Old 29th December 2012, 01:38 AM   #11
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Hi
All good stuff, thanks.
It won't be 10 years between power-ups, but it could be a while before he uses it again in anger. It's in a house in California, not a storage locker (which I might have implied) so I don't think damp will be a problem, but I will mention it.

Although he doesn't have his Marshall cab with him, I'll just hook up an old 8" 8-Ohm speaker to a 1/4-inch plug and send it to him so he can at least shut off the standby and have a load on the output. I know most SS amps have open circuit protection, but I wasn't sure about tube heads.
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Phil
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Old 30th December 2012, 04:22 AM   #12
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I'll send him a li'l old 8-Ohm 6.5-inch so heas something to plug in and turn off the standby
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Phil
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Old 30th December 2012, 09:52 PM   #13
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very slowly induce lower voltages/current/power is a great idea variac is a great tool
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Old 31st December 2012, 02:12 AM   #14
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In principle a Variac is fine, but it's only been three months since it was being used regularly, so I don't think there is much worry turning it on.
Phil
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Old 31st December 2012, 04:27 AM   #15
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probably not with only 3 months
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Old 31st December 2012, 04:28 AM   #16
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I thought like he was talking about years lol
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Old 2nd January 2013, 01:33 AM   #17
ivan H is offline ivan H  Australia
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Hi, yes it definitely needs a speaker or suitable dummy load hooked to the output to power it up, (not in standby). With regard to the filter caps, on another guitar amp forum they give the following instructions for forming new, or reforming electrolytics in amps. Disconnect the rectifier from the filters & hook it back up with a 100k, 2 watt resistor between the rectifier & filter caps, then power it up, periodically checking the voltage drop across the resistor. When the voltage drop across it is below a few volts the caps are formed. Drain the caps properly & remove the resistor, hook back up the way it was. This is current limiting the caps while forming them, whereas using a variac is only voltage limiting. Hope this helps. Cheers
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Old 2nd January 2013, 02:58 AM   #18
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Ummmm...no. I am not putting my hands in a tube head for any reason. No sir. Besides, it's 3000 miles away, and I only really wanted to know about firing it up every few months. I'll be surprised if it's more than a year before he is back in a band again.
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Phil
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