[Amps] YC156 operating parms for US amp build?

[Gary Schafer]

Hi Larry,

What do you get out of the YC156 with 100 watts drive and 3300 volts?

Thanks
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
> On Behalf Of Larry
> Sent: Monday, March 29, 2010 9:56 PM
> To: amps at contesting.com
> Subject: Re: [Amps] YC156 operating parms for US amp build?
> 
> 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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