Re: Antek transformers?


"J.P." <jpasano@xxxxxxxxxxx> wrote in message
news:e3sh235ndtnfrbrkqpq9jt9olnlimi2a1g@xxxxxxxxxx
On Fri, 20 Apr 2007 11:21:32 -0400, "Phil S."
<psymonds_no_spam@xxxxxxxxxxx> wrote:

Anyone here familiar with Antek power transformers? These look like a lot
of bang for the buck. What's the catch?
http://www.toroid-transformer.com/
I'm just blanching at the thought of actually buying new iron. Opinions
would be nice to have.

I'm thinking about the AN-1T250, two HT windings wired in series, it's
250-0-250 and more mA than I'd ever need for my project. It has plenty of
juice on the 6.3v winding, and I think I can use the 12.6v winding for the
bias supply. It says $33 shipped. It looks too good to be true.

(See my other threads...the project is a fixed bias Vibrochamp with 6AQ5
output tube.)

I've emailed them to ask if they will sell one unit. Haven't heard back
yet.

Phil

That might be an interesting deal...how much neg feedback volts do you
need? Less that 12v? Are those torrids used on ultralinear setups?
Read something a while back but do not remember where or exactly
what...J.P.

No, not NFB, bias supply. I think you are confusing the OT with the PT. I
need a PT. The tube calls for -12.5 on the grid. The tap is 12.6.
Rectified and with cap input, I'll have to knock it down some, but not
nearly as much as what I might take off the HT B+ supply. The cool thing is
that I could go either way. I got ants in my pants when they responded to
my email, so I placed an order. For that kind of money, I thought, why not?
The web site says it's for the guitar and audiophool amp market, so
intention is there. If I don't like it, I can fleebay it, probably for a
profit!

It's my good fortune that I built the bias supply circuit onto a turret
board, but something told me not to solder anything until I had the PT.
I'll be changing out several resistors because the original plan was to tap
the B+ supply.


.

Relevant Pages

  • Re: Antek transformers?
    ... Opinions ... juice on the 6.3v winding, and I think I can use the 12.6v winding for the ... The tube calls for -12.5 on the grid. ... The tap is 12.6. ...
    (alt.guitar.amps)
  • Re: Ping > Professor Turner
    ... It means the CT of the HT winding isn't grounded, ... >> bias voltage for the 6V6 or other output tube ... >> tube. ... > The theoretical reason for not putting the choke in the return lead, ...
    (rec.audio.tubes)
  • Re: The failings of the dynaco ST70.
    ... modern tube amplifiers or its contemporaries like the McIntosh, ... being a really good amplifier. ... resistance of the halves of the primary winding. ... For those who obsess about this the DC resistance of the winding halves ...
    (rec.audio.tubes)
  • Re: what the heck! DC on secondary??
    ... > the speaker tap is .7 ohms dc the NF tap is 27 ohms. ... > the amp has 4.5 v on the NF tap when on. ... > winding to ground.. ...
    (rec.audio.tubes)
  • Re: 5V equivalent of 6AU4?
    ... filaments off the 5 vac filament winding that was unused up to that point. ... A weak tube near end of life may not ...
    (rec.audio.tubes)