docc Posted November 29, 2015 Author Share Posted November 29, 2015 Last night I played off and on for several hours finally checking tube temps after the amp had been on for maybe four or five hours. I'm not sure what any of the parts are inside the "valve" but there is a hot spot glowing right in the middle. Aiming my infrared reader very carefully with the laser, both 6L6 output tubes were 346-350ºF and the rectifier, about 250. So, while they look plenty similar, I'm still really amazed how hot they get! I still need to get on those links you guys posted and study up. As soon as The Blues stops getting in the way . . . Link to comment
Zooter Posted November 30, 2015 Share Posted November 30, 2015 Charging metal up to where it gases off electrons on cue does involve a bit of a higher temp. Link to comment
Kiwi_Roy Posted December 1, 2015 Share Posted December 1, 2015 I used to fix a lot of old radios for friends and workmates, I didn't really know what I was doing but usually got lucky. Electric phonographs were a novelty, I would snip the wire going to the volume control and wire in a phone jack so they could plug the phonograph in. Valves are fascinating, I was lucky enough to do my apprenticeship before they were phased out. Sent from my shoe phone! Link to comment
docc Posted December 24, 2015 Author Share Posted December 24, 2015 I used to fix a lot of old radios for friends and workmates, I didn't really know what I was doing but usually got lucky. Electric phonographs were a novelty, I would snip the wire going to the volume control and wire in a phone jack so they could plug the phonograph in. Valves are fascinating, I was lucky enough to do my apprenticeship before they were phased out. Sent from my shoe phone! Wait - what? They've been phased out? I heard the same of two-valve, air-cooled, push-rod twins! 1 Link to comment
belfastguzzi Posted February 26, 2016 Share Posted February 26, 2016 There are quite a few of my silly possessions that fall in line with having a Guzzi. I'm not sure what the common denominator is exactly: analog, atavistic, anachronismal (alliteration!) . . . living long in the lower register? Funny, I was thinking this in another context and another place a few days ago. My thoughts were: Moto Guzzi Pentax cameras Land Rover bass guitar valve amps / turntables balls of string Apple Mac ... I'll stop now as Jaap is turning seriously green at the gills 1 Link to comment
docc Posted February 27, 2016 Author Share Posted February 27, 2016 I've heard of "balls of steel." See here: Real Men have balls of string!" Link to comment
moto fugazzi Posted March 18, 2016 Share Posted March 18, 2016 I installed new salt and pepper grill cloth on my Marshall JCM800 Bass head today. The previous owner had removed the black grill cloth, so it was blank. Ken 1 Link to comment
docc Posted March 19, 2016 Author Share Posted March 19, 2016 I installed new salt and pepper grill cloth on my Marshall JCM800 Bass head today. The previous owner had removed the black grill cloth, so it was blank. Ken Freakin' gorgeous! Worth making the picture appear twice! :pic: Link to comment
gstallons Posted March 19, 2016 Share Posted March 19, 2016 Didn't Jimi Hendrix use Marshall amps ? Link to comment
docc Posted March 20, 2016 Author Share Posted March 20, 2016 Didn't Jimi Hendrix use Marshall amps ? yup. My guitar buddy just scored a "vintage" Hendrix-tribute full Marshall stack in some shade of purple vinyl. I'm guessing Purple Haze . . . Link to comment
docc Posted December 30, 2016 Author Share Posted December 30, 2016 I finally broke down and got a tiny spray can of Caig DeOxit Gold to cheer up the Sport's electrics. The volume pots on the Bassman are pretty scratchy. Can I get some of the magic juice into them without the caps blowing me into the nearest parallel dimension? Link to comment
czakky Posted December 30, 2016 Share Posted December 30, 2016 Probably de-oxit is more well known in the audiophile circles then the gnarly, greasy, thoroughbred Italian two wheeled tamer circles.... Yer probably good. 1 Link to comment
docc Posted December 30, 2016 Author Share Posted December 30, 2016 Yeah, but I probably can't cock-up my nasty, old V11 *much* spraying anything on it (I think I proved this with zinc chromate ) . . . Can I just spray the pots? From the top? or take off the back panel and hit them from the bottom? Will it seep in? Link to comment
czakky Posted December 30, 2016 Share Posted December 30, 2016 I believe the "gold" is more of a lubricant. I know it is thin but I wouldn't expect it to penetrate a pot. Not gonna hurt either. I would first hit the pots (with the contacts exposed aka the back side) with a contact cleaner then a dab'll do ya with the "gold". Not an expert by any means but I have a little experience with potentiometers. 1 Link to comment
docc Posted December 30, 2016 Author Share Posted December 30, 2016 Sounds like I should take the back panel off and carefully put the amp on its top and see what I can see. Interesting the Caig "Gold" is very "oily." Link to comment
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