Bare Knuckle Pickups Forum

Forum Ringside => Tech => Topic started by: Bird on March 27, 2006, 09:57:24 PM

Title: Pulling out old tubes
Post by: Bird on March 27, 2006, 09:57:24 PM

How long should the amp be without power before pulling the old tubes? I've heard you can get a jolt if you don't let it sit for a bit  :?

Title: Re: Pulling out old tubes
Post by: Searcher on March 27, 2006, 10:05:46 PM

Quote from: Bird

How long should the amp be without power before pulling the old tubes? I've heard you can get a jolt if you don't let it sit for a bit  :?

Really? From the tubes themselves? Never heard of that.  I know you can seriously fry yourself by touching other areas though.

Title: Pulling out old tubes
Post by: Bird on March 27, 2006, 10:08:14 PM

I've heard of it but I'm not sure of the technical reasons behind it.

Title: Pulling out old tubes
Post by: HJM on March 27, 2006, 10:20:48 PM

You'll burn yourself first - actually you can get a jolt, if you manage to get close to the pins when you pull the tube it you may get a flash of HT!

The old trick of leaving standby ON and turn the power off  leaving a chord hanging on the guitar. Can help discharge dangerous voltages quickly. It drains the charge in the filter caps.

I usually learn the hard way on things like this.......if it's an old amp watch the top of the filter capacitors.....the old ones weren't always insulated (got shocked twice on an old Orange, first time I thought 'what was that? so touched it again....dumb!)

Title: Pulling out old tubes
Post by: donovan.x on March 27, 2006, 10:25:59 PM

Obviously not greatly hilarious to you, but I haven't laughed that hard since"Something about mary".  :lol:  :lol:  :lol:

Title: Pulling out old tubes
Post by: Bird on March 27, 2006, 10:26:00 PM

Thanks :)  It's been off for about 4 or 5 hours, I'll be careful not to touch anything but the tubes while I'm back there.