"Patrick Turner" <info@[EMAIL PROTECTED]
> wrote in message
news:481DED13.3F4D42A4@[EMAIL PROTECTED]
> The whole business of an IST is difficult.
>
> The parafeed I mentioned above is the best I have used,
> wide BW, with slight shelving of response at LF and HF,
> and no added iron cause distortions at any F.
>
> One can also use a µ-follower which also works well,
> or use a pentode for the dc anode supply with extremely high AC
> impedance.
>
> I like the parafeed choke plus R method because it works, and sounds
> well,
> and has electronic simplicity of elements, even though
> you would need a choke with 25mm square core section and have
> 7,000 turns of fine wire, and just the right gap size.
A belated THANK YOU to Patrick (I was hoping you would respond) and
everyone
else who replied! I know that interstage transformers are a well known
design option, I just thought it was interesting to read a manufacturers
deatiled explanation for using it as opposed to other specific choices.
Jim Hagerman is coming out with a new and unusual 2A3 amp. Here's a quote
from it's description:
"Distortion is exceedingly low, especially given the fact that no feedback
is used, thanks to the harmonic cancellation of the output stage, which
operates partially in both single-ended parallel and push-pull
differential
modes. This balance results in SET-like musicality yet with PP control and
dynamics."
Here's the link to the manufacturers web page for the new amp:
http://www.haglabs.com/pa10.html
What do you think? Thanks.
Gerry
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