Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: DummyLoad on August 29, 2022, 09:25:39 pm
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Dusting this project off...My spin on a 5E1 - EL34 output tube. Going to sub in a 12BZ7 to shoot for maximum gain with this ckt.
I haven't built a Champ into a chassis/cabinet yet. No Champ amp shall go unmodified. I may actually build this one. :icon_biggrin:
Fairly quiet amp, even on the breadboard.
--Pete
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El Champ on the BB
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Impressive breadboarding going on there
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Impressive breadboarding going on there
Thanks Pete!
--Pete
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Very nice breadboarding, indeed. Is the a special name for that kind of terminals?
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Very nice breadboarding, indeed. Is the a special name for that kind of terminals?
Two row barrier strips -or- Double row barrier strips. The ones I use are on .375" (9.5mm) centers. The ones I use specifically are becoming increasingly difficult to find, as I require what's called a wire clamp screw, or sometimes also called a wire captive screw. To circumvent, I buy the 20 position model and buy the wire clamp screws from another source. beware that some barrier strip screws are metric, most are 6-32 screws, but some are also metric, typically M3.5x.06x6mm screw - Links below to a source for both metric and inch pattern clamp screws and barrier strips.
https://www.mpja.com/Pack-of-10-6-32-Screws-with-wire-clamp-for-Power-Supply/productinfo/31980%20HD/
https://www.mpja.com/Pack-of-10-Screws-m35-06-with-wire-clamp-for-Power-Supply/productinfo/31981+HD/
Metric:
https://www.allelectronics.com/item/ts-210/dual-row-barrier-strip-20a-10-circuit/1.html
Inch:
https://www.newark.com/multicomp/mc24323/terminal-block-barrier-20-position/dp/14N5652?gclid=CjwKCAjw6raYBhB7EiwABge5KhNcWqvtK1FqWQL7lvPrKVuZ08gJ5echaxTDnBm6am8SBaxo3Rrq8BoCOb8QAvD_BwE&mckv=_dc|pcrid||plid||kword||match||slid||product|14N5652|pgrid||ptaid||&CMP=KNC-GUSA-GEN-Shopping-PMAX-Med-ROAS
https://www.digikey.com/en/products/detail/molex/0387700320/3301061
Google search for "two row barrier strip" and you'll have more hits than you'll have time to sort through.
--Pete
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Impressive breadboarding going on there
That IS the most adorable little breadboard I have ever seen :huh:
You should tell the guy who labels your BBs that you are using an EL34 this time. :icon_biggrin: Is he the same guy who cuts your lawn?
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GREAT IDEA for bread boring. I bought one of those strips yesterday at the big box store to fix a control wiring mess by the A/C technician.
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....I bought one of those strips yesterday ...to fix a control wiring mess by the A/C technician.
I got a "trailer junction box"--
https://www.amazon.com/MICTUNING-Way-Electrical-Trailer-Junction/dp/B07QDQRX7P
7 studs is enough for most heat/AC thermo-control wiring, box protects against paint-cans and dead amps shoved against the furnace. Run of CAT-6 net-cable from the furnace computer terminals to this box outside and up at working level (my furnace PCB is hardly off the floor). Side-run for the hour meter and condensate pump shut-down.
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Impressive breadboarding going on there
That IS the most adorable little breadboard I have ever seen :huh:
You should tell the guy who labels your BBs that you are using an EL34 this time. :icon_biggrin: Is he the same guy who cuts your lawn?
Nah, he's the guy that plays the stratocaster while on fire... :icon_biggrin:
--Pete
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....I bought one of those strips yesterday ...to fix a control wiring mess by the A/C technician.
I got a "trailer junction box"--
https://www.amazon.com/MICTUNING-Way-Electrical-Trailer-Junction/dp/B07QDQRX7P
7 studs is enough for most heat/AC thermo-control wiring, box protects against paint-cans and dead amps shoved against the furnace. Run of CAT-6 net-cable from the furnace computer terminals to this box outside and up at working level (my furnace PCB is hardly off the floor). Side-run for the hour meter and condensate pump shut-down.
I'm replacing a Carrier thermostat. It's a two board control; one at the furnace, and a separate board at the thermostat. I re-purposed the cover for the board at the furnace to house the terminal strip.
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my Champ'ish perversion
I didn't use HIGHGAIN tubes so there's more than 2 :laugh:
always ASUME my schematics have flaws (it may be a rev or 6 behind also) :icon_biggrin:
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my Champ'ish perversion
Now that's a real man's output tube there.
I think DL should have to call his the El Chumpo (after the weak younger skinny cartel brother)
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my Champ'ish perversion
I didn't use HIGHGAIN tubes so there's more than 2 :laugh:
always ASUME my schematics have flaws (it may be a rev or 6 behind also) :icon_biggrin:
No but 184=104976 overall gain of your preamp;
beats my lowly pair of triodes... 502=2500 - you win! :cussing:
However, I have 1 less tube to wire filaments to, so I win! :blob8:
--Pete
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:laugh:
IIRC the last stage became a CF on the 2nd tweak-round
and
I did catch the big tube bug from some of your "lets see what a pair of 120's runnin hot....." experiments
win or lose, it's all about stealin circuits :icon_biggrin:
(the pre-is a molested steal from Steves juke-box build)
this one did make it into the wild, always a good indicator, I got close enough
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my Champ'ish perversion
Now that's a real man's output tube there.
I think DL should have to call his the El Chumpo (after the weak younger skinny cartel brother)
Ha! EL Chumpo? No! KT ChampMacho Seņor!
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Looks like you've got more cojones than el buen sentido there Ese
I can still see the EL in the pic so I know this was just a photo op = busted
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looks like there's someone stuck inside your tubes trying like hell to get his magic rectangle to help escape :icon_biggrin:
buenos no-chez seenyourz
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El Champ on the BB
Nice breadboard! Have you seen these?
https://www.ebay.com/itm/152240765977 (https://www.ebay.com/itm/152240765977)
{edit- trimmed eBay tracking data -- PRR}
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El Champ on the BB
Nice breadboard! Have you seen these?
Yes, and thanks!
--Pete
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El Champ on the BB
Nice breadboard! Have you seen these?
Yes, and thanks!
--Pete
I think you meant to say "Thanks, and yes!"
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El Champ on the BB
Nice breadboard! Have you seen these?
Yes, and thanks!
--Pete
I think you meant to say "Thanks, and yes!"
Yes, thanks! :p
--Pete