[Amps] Triode Amps

[gudguyham at aol.com]

Google Kessler engineering.  He sells a special kit for TL922 amps under that name.  You’ll find his website.  I tried for information on my Palstar amp, but didn’t get much satisfaction.  I’m not pointing an fingers but all involved including us got hurt.  There was a lawsuit over the issue so you know how that can get.


Sent from the all new AOL app for iOS


On Friday, December 3, 2021, 6:58 AM, AJ <iamfromcanadaalso at gmail.com> wrote:

Ok so how do I get in touch with him then?
I looked for an e-mail address none to be found.

No issue with replacing the filament transformer I have one I could use.
Yes tested it out of the circuit.

I have no idea about the logic board, there others out there can can be
retrofitted if needed.

AJ___ VE3HJ

On Thu, 2 Dec 2021 22:44:57 +0000 (UTC)
"gudguyham at aol.com" <gudguyham at aol.com> wrote:

> The Palstar version of Commander was always   Don Kessler.  There was
> about one full run of the line sold and I don’t believe the second
> run ever went into production.  I have two of the Palstar 2500’s and
> I had an issue and got no satisfaction.  WE are pretty much alone and
> are going to have to fend for ourselves.  I haven’t checked the
> schematic but you can sure use a generic transformer for the
> filaments.  There are tons of 12.6v transformers out there that with
> a little to no tweaking of the primary voltage you can land 13.2volts
> on the three filaments total.  If you use a 12.6. 4 amp rated
> transformer on 1 tube, the filament voltage will be spot on.  For 3
> tubes you’ll need a 12amp 12.6v transformer.  If it’s a tad higher
> you can tweak the input voltage with a high wattage chassis mount
> resistor.   The other option is to see if an old 2500e transformer is
> kicking around.  I assume you have throughly tested that transformer
> before you condemned it?  
> 
> Sent from the all new AOL app for iOS
> 
> 
> On Thursday, December 2, 2021, 5:08 PM, AJ
> <iamfromcanadaalso at gmail.com> wrote:
> 
> 
> 
> My current issue is with a Palstar 2500E which is a totally different
> beast compared to the previous Commander versions. Only a handful of
> them made according to Paul.
> 
> It has three 3CPX800A7's in it. The plate transformer is twice the
> size of the early Commander 2500E.
> 
> So make a long story short. . .
> 
> Filament trans primary open.
> Filter caps bulged.
> Diodes shorted
> Tube filaments open
> Step start contacts welded.
> 
> I have yet to test the plate transformer, I do not have any specs on
> it. There is no part number on it. I have contacted Paul at Palstar he
> has no info as that product line was sold.
> 
> I have sent and e-mail to the owner (not positive if I have the
> correct persons info) of the Palstar design; nothing back as of this
> time.
> 
> If anyone on here knows how to contact the current owner of the
> Palstar design please let me know off list.
> 
> Thanks AJ___ VE3HJ
> 
> 
> On Thu, 2 Dec 2021 16:19:09 -0500
> "Tim Duffy" <k3lr at k3lr.com> wrote:
> 
> > My favorite triode for 1500 watts all day is a single 8877. 4KV and
> > 30 watts drive.
> > 
> > Used 8877s exist and are more than capable for long lives. Some of
> > the 8877s at K3LR have date codes from the 70s... still going strong
> > 
> > 73
> > Tim K3LR
> > 
> > -----Original Message-----
> > From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Peter
> > Voelpel Sent: Thursday, December 2, 2021 4:16 PM
> > To: 'Kim Elmore'; amps at contesting.com
> > Subject: Re: [Amps] Triode Amps
> > 
> > Eimac specifies 890W for a single tube at 3.5KV plate voltage and
> > 740W at 3kV.
> > 
> > 73
> > Peter, DJ7WW
> > 
> > -----Original Message-----
> > From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Kim
> > Elmore
> > 
> > 
> > The 3-500Z is an excellent tube, but 1500 W isn't reasonably
> > available out of a pair, even at increased plate voltage
> > 
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