#1
Hey, first thread at this forum! Anyway, I'm planning to buy a Blackheart Little Giant, a 3-5 watt class A tube amp, a very basic one. It is very good sounding and looking, but it lacks a standby switch. So now I'm asking, how hard would it be to add the switch to it? I don't have any schems or anything, but in a general theory? Thank you!
"You can't play fast unless you play slow"
#2
"In general theory" you don't need one...otherwise they'd put one in.

http://www.freewebs.com/valvewizard1/standby.html
That site has some very useful ideas on standby switches that are useful.
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#5
http://www.freewebs.com/valvewizard2/OtherStuff.html
http://www.geofex.com/Article_Folders/mosfet_folly/mosfetfolly.htm

If you do want to use a standby for the power tubes (really, the only ones that would merit using a standby) you could use one of the above standby switches. I would be inclined to use the GeoFEX one if I had to choose. No HV switching, you can take the 12v from the heaters if you'd like.
#6
Thanks for the links! I'm interested to add the standby switch just because I don't want to change the tubes too often. The switch adds more life to the tubes, if used correctly, right? Thanks!
EDIT: Yeah yeah I read some info and now know more about the switch. Yay.
"You can't play fast unless you play slow"
Last edited by Supercolio at Jul 23, 2011,
#7
Quote by Supercolio
Thanks for the links! I'm interested to add the standby switch just because I don't want to change the tubes too often. The switch adds more life to the tubes, if used correctly, right? Thanks!
EDIT: Yeah yeah I read some info and now know more about the switch. Yay.

With some amps, yes it will extend the tube life, but that amp is designed that way for a reason..... It doesn't need a stand by.
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#8
Like others have said, you don't really need one. Tube life won't increase much, if at all.

Why do you want a stand by switch?

If you want it to mute the amp, you would be using the standby switch wrong. A mute switch is easy.

If you want it to let the tubes warm up, don't worry about it too much. Most modern amps have a soft start built in.

I don't know about the Little Giant, but cathode stripping on start up is less likely to happen than by extended standby switch usage. I'd much rather have voltages on the tube plates and cathodes than on one and not the other. Bad juju there. The original stand by switch was usually to keep the tube rectifier from blowing on start up, or to keep the initial filter cap from blowing during the start up spike from a cold rectifier.