Bob
Guest
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 Posted:
Thu Dec 01, 2005 1:35 am Post subject:
Re: 240vac xformer and tube amp |
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On Tue, 29 Nov 2005 22:12:55 -0500, "Phil S" <psymonds_no_spam@comcast.net>
wrote:
-snip-
| Quote: | As for addictive amp building - I'm now working on number twenty
something...
I'm trying toroids this time!
Well you dropped in at a decent time. Between the filters and whatnot,
things are down below a dull roar at the moment. I don't think it will stay
that way. Anyhow, it was nice to see you drop by. Toroids, huh? What's
the deal with them?
Phil
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A toroid has the advantage of a more compact magnetic field, and I thought that
would give an advantage to players who like to sit on their amps, and get hum
broadcast into their single coils. I'm putting the toroids on the bottom of the
amp chassis, and there should be no radiated field outside the amp.
I will test it with my Strat, a sort of $1000 magnetic field finder!
Toroids aren't all peaches and cream though, their wide frequency response can
bring more line noise into the amp... I may put a ferrite choke on the power
wires...
not to mention their price, about double a standard unit. I need 2, for filament
and plate supply, cost me about $100.
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Bob
Guest
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| Posted:
Thu Dec 01, 2005 1:35 am Post subject:
Re: 240vac xformer and tube amp |
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On Wed, 30 Nov 2005 03:31:07 GMT, Doggone <running@parked.cars> wrote:
-snip-
| Quote: |
As for addictive amp building - I'm now working on number twenty
something... I'm trying toroids this time!
Amp junkies can be itentified by the solder burns on their hands.
Do you know of a source for toroidal transformers with both a high voltage
and filament windings or do you wind your own? I found Hammond have decent
toroidals but don't have mixed windings. They also tend to be quite pricey. I
find it had to justify the extra cost when recycled iron can be had so cheap.
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I'm trying a pair of Hammond's right now! I will do some tests between identical
amps with and without torus transformers. I've never seen a tube type power
toroid... you'd have to order it made.
I might also try a standard filament tranny with a toroid plate tranny... I
bought a box of E-I filament trannys cheap - about $7 each, with slight damage
cosmetically speaking... 12.6VCT @ 2A ... was a good deal so I want to use them.
| Quote: | Is there such a thing as a toroidal output transformer?
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I haven't seen one - don't know if there is an advantage to one...
| Quote: |
thinking>......... R.K. style......................................
Would the core end up being unrealistically large? What do you think?
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I'm not a tranny expert by any means, although I have wound a lot of them! I
couldn't tell you how a torus would do as an output... but for fun I may try a
toroid filament tranny as an output... it would match an EL84 to 4 ohms! But it
may saturate with the DC... |
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