Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: bruno on October 05, 2010, 05:23:40 pm
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I'd like to know if anyone can help me finding a place where I can order a transformer with a 180V-0-180v high voltage tap, 6,3V tap for heaters, 5v tap for rectification and 250ma current handling.
Thanks
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Unknown.What are you building with that?That low a voltage and that high a current handling smells class A something with 4 power tubes to me.
Hammond will make one for you.Not that expensive at all.
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Is this close enough...
Hammond 263CX I think they are about $60 retail.
116VA
sec. 180-0-180, DC ma 250,
Fil. #1(rectifier) 5.0v @ 3a ct
No 6.3V, but a filament transformer is pretty small (think fender choke size).
A 4A 6.3V from Hammond is like $12, so your total is about $80 with shipping
perhaps?
That is all I can think of, other than calling Heyboer and saying "I need a transformer
that has..." Hrmmm, for a single from Heyboer, the two trannies from Hammond will
probably be cheaper, unless you want 10 or more of them.
Just my $0.02.
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Try Edcor
http://www.edcorusa.com/Home.aspx
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Hi guys, thanks for the answers...
Phsyconoodler, it will be used on a two 6v6s, push-pull class A output stage (I'm ordering a high current handling in case I end up going with 4 output tube stage). Not sure what the pre amp will be yet, just messing around with ideas, until I get something I like.
Well I had looked at the 263cx and what made me backup was the lack of a 6.3v tap, but I didn't even remember I could order a separate 6.3v transformer, I guess I might just do that.
I've also looked at edcor, but couldn't find what I wanted, although I know they make them, but it would have to be a custom order, just like heyboer.
Thanks guys
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Try Edcor
http://www.edcorusa.com/Home.aspx
I've also looked at edcor, but couldn't find what I wanted, although I know they make them, but it would have to be a custom order, just like heyboer.
Edcor = American made.
Edcor charges a 1x fee for a custom build... but after that if you need even just one more with those specs in the future, that custom build fee is history.
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No 6.3V
You can most of the time pick instead a 300-series with filament windings, a larger core sized for 50 Hz and world voltages (100 to 240V pri). But alas not here...
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http://www.edcorusa.com/Products/ShowProduct.aspx?ID=500
no 5V sec. request they wind it with one.
probably drive the cost up 5-10$ with the additional winding + the 40$ design and setup fee.
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> two 6v6s, push-pull class A output stage
Two 6V6 250V 10K can run Class A, or so close that who cares? Plate current rise is only 10%; that's far closer to A than to B.
180VAC with bottle rectifier will be much less than 250VDC. If you double-up the SE 180V condition, 11K load, you get like 4 Watts output. Seems like a lot of trouble for four watts. It may be easier to run 280V 20K load, get 7 Watts of pure-A output.