My YC-156 runs just fine with 3300 volts on the anode under load. At
that level it will see 1500 out with about 40 watts of drive. I have the
ZSAC set for approximately 200 ma. That's more than enough to see good
linearity at that low output level, but some what higher would be better
if you leaned on the drive harder.
On a dummy load using the FT-1000D (don't normally use that radio with
this amp) I can see just under 4 kw out before the AC line breaker trips
out, and that's with around 180-190 watts drive. This is not something I
would recommend, I only did it to satisfy my curiosity.
15v/15 amp is what I'm using for heater power.
No "supprssors" of any kind needed, very stable operation and easy to
tune up, at least on the bands I have it set up for. The only real
complaint I have is the 6+ minute heater warm-up time. In that amount
of time I can usually work the DX barefoot.....
Much faster and easier to use the 2x3-500Z's (or the 4x813's, or the
3x4-400A's, etc.)
73,
Larry - W7IUV
DN07dg - central WA
http://w7iuv.com
On 29-Mar-10 5:55 PM, Jim Barber wrote:
> Assuming all this YC156 chatter motivated me enough to start yet another
> project, I'm curious what a good set of operating parameters would be
> for a YC156 GG US-legal-with-significant-headroom amp?
>
> My built-in seatofthepantsometer comes up with 5KV on the anode and a
> 20-35V bias supply. I notice, though that others who have published
> YC156 projects on the web are running as much as 7KV on the anode, which
> at least appears to my untrained eye and the data sheet as being outside
> spec for the tube. ?
>
> Also -
> Harbach shows a 15V, 15A low-profile transformer in the amateur catalog.
> Since that happens to be exactly the YC156 filament requirement, would
> that be adequate? (I've always had that question about filament
> transformers in general, but haven't asked it out loud before)
>
> So many questions...
>
> Thanks,
> Jim N7CXI
>
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