Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: billcreller on February 02, 2011, 09:39:56 pm
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Has anyone here ever built a Fender Princeton 5C2? I realize it's just a small amp. I've had the schematic on the wall here near my PC for a year. No idea what PT HV secondary would be about right, or what OT would work.(?) Very simple little amp. Looks to be maybe 5 or 6 watts with the single 6V6 (?)
A friend In Hawaii has one of these, and likes it for around the house, or miking it through the PA system.
Anyway, I'm with the idea of building one.
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Isn't that a Champ with extra chrome?
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nope - 5C2 uses 6SC7 cascaded. champ 5C1 uses 6SJ7. looks like same PS and output scheme.
edit - 5C2 has tone knob.
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> 5C2 has tone knob.
Yeah. What I said.
Like a K2500 Silverado has nicer seatcovers than the base K2500, the Accura has a radio that adjusts for road-roar and the Accord doesn't, etc.
The Princey may have a bigger-better speaker or cabinet..... I can't remember this morning and the 1950s don't come in much better.
6SC7 is not radically different from 12AX7, and the odd values Leo used on AX "could" have been hangover from SC design.
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6SC7 is not radically different from 12AX7, and the odd values Leo used on AX "could" have been hangover from SC design.
like most all manufacturers do... glue this to that and market.
i used to build HVAC stuff... prod line engr. for instance what didn't make the grade as a 50A hybrid bride usually made spec as 25A device. all loose incoming dice were rejected that didn't make 600V blocking in acceptance testing, after mounting to substrate, that's another story - we sold a respectable amount of 400V product.
spec lower - less profit, but profit nonetheless.
add a knob and a quartet of parts, use a lesser cost tube, charge more for whistles and bells.
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I'm looking at a Hammond 271X PT, with 280-0-280 @ 60 MA secondary HV winding. How's that sound?
Rectifier is a 5Y3.
A Champ OT would work OK wouldn't it? There's one made by Hammond, an 022905/124A53A, listed for a Champ, but it has a CT on the primary, which confuses me......
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A Champ OT would work OK wouldn't it?
absolutely! in their day they likely had same part number.
Hammond 271X PT,280-0-280 @ 60 MA
original champ PT was 325-0-325 @ 80mA - hammond 271X will work but obviously deliver less B+ w/ same ckt. and tube recto - 271X w/ SS recto gets you closer to original champ B+ values.
hammond champ PT replacement is p/n 290AX.
hammond champ OT replacement is p/n 1750C.
...made by Hammond, an 022905/124A53A, listed for a Champ, but it has a CT on the primary, which confuses me......
confuses me too, i can't see that - link please?
http://www.hammondmfg.com/pdf/EDB1750C.pdf
:smiley:
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That OT was listed in the Antique Electronics catalog, but it wasn't listed with the Hammond stuff. Page 28 in their catalog.
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That OT was listed in the Antique Electronics catalog, but it wasn't listed with the Hammond stuff. Page 28 in their catalog.
if this (http://tubesandmore.com/Catalog/page_028_029.php) is what you are referring to, then i'd question the catalogs' accuracy - trust in the hammond URL.
start here... (http://www.hammondmfg.com/claspg.htm)
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I may be restating the obvious, but the octal Princetons were single ended- and the transformer in the AES catalog looks to be for the later PP models. (kinda like the early Chevy stovebolt 6's vs the later V-8's to keep PRR's metaphor alive). Why youse lookin' there for? Dosen't Doug have some fine transformers? :grin:
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I confess that I haven't looked at Dougs yet :angel but that's where I would rather get the stuff. :smiley: