terminating unused wiring bundle question

[Leo_Gnardo]

Hi Leo, that's in teresting. So, do you put copper foil over teh wiring, then some kind of insulation over that? I have a piece of fiberglass board that's thinner than the eyelet/turret board stuff. Can cut a piece of that to keep the copper from shorting something out.

In one case a bundle of OT wires sprouted up from the chassis, right under the most sensitive point on the circuit board. Perfect setup for ultrasonic oscillation. I made a sandwich, this time out of two slices of fish paper with a layer of copper foil between. Ran a wire from the copper to a chassis ground. No more oscillation. Fargen serial #7, I guess he was still learning.

Maybe I'm just an old fogey, but I think a big bucks booteek builder should really prove his build works, without built-in problems like this, before selling them to customers. Now he's 15 years further along in his career, I hope he's not doing anything like that for the last 14.

[Chuck H]

Not to derail Mikes thread, but...

Surely anyone selling amps for big bucks (which, btw, doesn't mean big profit ) is testing both the design in general before building AND the individual amp under ALL playing styles and conditions before giving it a pass.?. I've made a dozen amps. Three of which aren't in circulation (two pre production models (Dean Markley has one and I have the other) and the prototype for those(my personal amp). I never let an amp off my bench before it was "right". I could understand getting stressed and needing to deliver a product. But if the extra expense of bewteek gear doesn't cover AT LEAST what I offer then why should the customer spend the money? If I bought a custom amp and it was squealing when I cranked it I would surely feel my off had been pissed on.

[mikepukmel]

In one case a bundle of OT wires sprouted up from the chassis, right under the most sensitive point on the circuit board. Perfect setup for ultrasonic oscillation. I made a sandwich, this time out of two slices of fish paper with a layer of copper foil between. Ran a wire from the copper to a chassis ground. No more oscillation. Fargen serial #7, I guess he was still learning.

Maybe I'm just an old fogey, but I think a big bucks booteek builder should really prove his build works, without built-in problems like this, before selling them to customers. Now he's 15 years further along in his career, I hope he's not doing anything like that for the last 14.

Leo not kidding. When they charge that much, they sure shouldn't be doing rank amateur stuff. The name struck a bell, don't know Fargen amps but do you remember the line from Johnny Dangerously?

[mikepukmel]

Not to derail Mikes thread, but...

Surely anyone selling amps for big bucks (which, btw, doesn't mean big profit ) is testing both the design in general before building AND the individual amp under ALL playing styles and conditions before giving it a pass.?. I've made a dozen amps. Three of which aren't in circulation (two pre production models (Dean Markley has one and I have the other) and the prototype for those(my personal amp). I never let an amp off my bench before it was "right". I could understand getting stressed and needing to deliver a product. But if the extra expense of bewteek gear doesn't cover AT LEAST what I offer then why should the customer spend the money? If I bought a custom amp and it was squealing when I cranked it I would surely feel my off had been pissed on.

Oh man, yeah, true. And what if it was worse, and didn't squeal but digested itself? heh.

[Leo_Gnardo]

do you remember the line from Johnny Dangerously?

heh.... reminds me every time

Somewheres about that time my old friend and sometimes customer Jim Weider co-developed an amp with Mr. Fargen. I'm sure it must have sounded fabulous, after a countless back 'n forth across the USA. I heard by the time Jim deemed it acceptable, poor Mr. Fargen was ready to be admitted to the Institute for the Very Very Nervous. Better him than me, I say. Hope he's OK now.

[loudthud]

Here's a link to the thread mentioned above about how to wire the secondary to get at least two secondary impedances on a switch.

Link: https://music-electronics-forum.com/...ad.php?t=46637

[Dave H]

I remember Benjamin Fargen asking questions on here (Ampage) before he started building amps. It seems like only yesterday but it was over 20 years ago

[mikepukmel]

Here's a link to the thread mentioned above about how to wire the secondary to get at least two secondary impedances on a switch.

Link: https://music-electronics-forum.com/...ad.php?t=46637

Ah Bing!!! Thanks. At least my memory isn't so shot that I didn't remember there was a thread (although I couldnt find it). I have to download and print...

[nevetslab]

OK thanks again, I'll take the OT apart and see how much room between the transformer and bell body. Hope there's enough room. Looks like I made it way hard on myself for this build, thought it was going to be easy, breezy. No breezing so far. (Thank God for Jerry Murad and the harmonicats)

If it turns out the unused primary / secondary leads won't fit inside the end bell, you could re-route that unused bundle toward the power/SB switch, and around that corner and secure there. 3M offers copper tape (adhesive back), which works well for wrapping / shielding purposes. Heat shrink sleeving over that (with a grounding lead from the copper tape to go to chassis ground) would be a suitable alternative.

[mikepukmel]

If it turns out the unused primary / secondary leads won't fit inside the end bell, you could re-route that unused bundle toward the power/SB switch, and around that corner and secure there. 3M offers copper tape (adhesive back), which works well for wrapping / shielding purposes. Heat shrink sleeving over that (with a grounding lead from the copper tape to go to chassis ground) would be a suitable alternative.

Thanks Nevetslab. (also, hope you and family are safe from the fires in CA).

[mikepukmel]

heh.... reminds me every time

Somewheres about that time my old friend and sometimes customer Jim Weider co-developed an amp with Mr. Fargen. I'm sure it must have sounded fabulous, after a countless back 'n forth across the USA. I heard by the time Jim deemed it acceptable, poor Mr. Fargen was ready to be admitted to the Institute for the Very Very Nervous. Better him than me, I say. Hope he's OK now.

Im searching the 'net for a pro amp builder with the last name Bastage, to join up with mr Fargen so we can get a Fargen Bastage amp.

[nevetslab]

Thanks Nevetslab. (also, hope you and family are safe from the fires in CA).

YES, thanks for asking. The closest one that sprang up was last Friday, in Griffith Park, a few miles from where I live. Scary events up and down the state right now, and with Trump suggesting funding to aid the victims of the fires may be withheld!

[mikepukmel]

YES, thanks for asking. The closest one that sprang up was last Friday, in Griffith Park, a few miles from where I live. Scary events up and down the state right now, and with Trump suggesting funding to aid the victims of the fires may be withheld!

Glad to year you're OK. Hard not to get on my soap box, but I was furious and sad at the president's comment.

[mikepukmel]

On a lighter note, got together with my assistant and started working on removing the transformer to check clearance with the end bells. He's an expert machinist so Im relying on his experience. That's me on the left.

[g1]

"Hammer at the ready"