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A3rd.Zero 21st March 2004 07:53 PM

Transformer for a tube amp question
 
I am using a Hammond 261c6 power transformer for my tube pre amp and I only need 110v out of it (it is a 220V centertapped). If I just use the centertap and one end of the winding can I clip the other end of the winding short and just tape it?

Primary 1___.......___+110V
.................) || (
.................) || (___ 0V
.................) || (
Primary 2___) || (____-110V

Thanks for the help.

Milo

edit: formatting

SY 21st March 2004 08:41 PM

Yes.

What is it you're trying to do? Maybe there's a better approach.

A3rd.Zero 21st March 2004 08:51 PM

The tube pre amp that I am building is much like the Morgan Jones one over on Headwize, except it uses a 12au7 and two 6Dj8's insted of three 6dj8's. In the power supply section of the schematic it calls for a 110V secondary winding and a 6.3V secondary winding. The transformer that I have on hand is the 261c6 which is setup to give 220V but I though that because of the center tap I could use it for the 110V required by the schematic.

The Preamp is a clone of the Radii HAP-03 incase that helps. I could email you the schematic if you are interested.

Thanks for your help.


Milo

SY 21st March 2004 09:31 PM

Yes, I'd like to see a schematic. Thanks!

Zen Mod 21st March 2004 09:46 PM

mebbe is better solution to use both halves ?
CT to ground,and wo diodes (one per half) to + output-just like good ole vacuum rectifier?
in that case your tranny will run colder

stormy 21st March 2004 10:51 PM

Quote:

Originally posted by choky
mebbe is better solution to use both halves ?
CT to ground,and wo diodes (one per half) to + output-just like good ole vacuum rectifier?
in that case your tranny will run colder


I agree with this

better not to leave floating windings ;)

SHiFTY 22nd March 2004 05:46 AM

Yes, you should use a full wave rectifier, then you only need 2 diodes! Less sand in your system! :D

A3rd.Zero 22nd March 2004 02:37 PM

Ok, here is the schematic. I know that there are better ways to do this but Im trying to stay as close to "cloning" the amp as possible. I plan to use 4 FREDS for the fullwave rectifier, each is rated to 12A and 1200V so even if I parallel the winding I won't be heating up the FREDS. Is there a problem with supplying twice the amperage to the amp, or will it only draw what it needs anyway?

Thanks for your help guys.

Milo

edit: spelling

A3rd.Zero 22nd March 2004 02:39 PM

oops, here it is.

http://members.cox.net/jmilotrain/HAP-03%20small.jpg

Milo

fdegrove 22nd March 2004 02:57 PM

2 Attachment(s)
Hi,

That looks alot like a headphone amp I've seen on Headwize.
Runeight, was that yours?

An anode follower DC coupled into a WCF, nice.

It's very easy to add a bigger cap on the output and a jack so you'll be driving your cans with it as well.

Here's something similar I toyed with a while ago:

Cheers,;)


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