[Amps] Big HV Supply
jim.thom at telus.net
Wed Aug 8 11:52:44 EDT 2018
Sent: Wednesday, August 8, 2018 7:44 AM
To: Jim Thomson ; amps at contesting.com
Subject: Re: [Amps] Big HV Supply
<The LK-550 runs three 3-500's and cooling would likely limit power as it is
a fan. Ive had them up to 2200W or so with 150W drive....nothing to brag
Ive built several LK-800's for 6M EME that do a solid 5 out without
complaining and going to a good EBM fan.
On HF I dont know how well the bandswitch will hold up over time and the
fixec C used needs beefing up.
Another thing I dont know is tube life at that power but money isnt
important to some.
BTW what is a full output YC-156 going for these days? It came from Tom,
WD8??? ages ago. Also have a filament xfmr and one of those UK sockets all
set up for good air flow. I'll never get around to building another amp and
dont need QRO here.
## YC-156 does not use a socket. Its got a grid flange that just bolts to
Then the fil lugs below. Indirectly heated like a 8877. Eimac sez 6 min
warm up minimum, but
Reid Brandon and I talked about that years ago, and he highly recommended a
full 8 mins.
Typ they go for $400.00 for a good one. I dont recommend it these days
are real scarce... and are just pulls of pulls. The 11m ops have beaten the
crap out of them
too. I designed a YC-156 80-10m for a local buddy, and he bought a total
of 12 tubes, TWELVE,
and only 3 are any good. What typ happens is you end up with a grid to
fil short, or grid to cathode
short after just 5 mins..with fil on, blower on, and NO B+. Without at
least 2-3 known good tubes,
I would not build a YC-156 from scratch. Loads of YC-156 amps out there,
so should be easy to sell,
with the provisio that the tube functions in a working amp. Buddy bought
every YC-156 he could
get his hands on...and 9 were duds. One good one, and 2 x semi good ones.
## That OM power OM-4000 HF sells for $6K..and does an easy 4-5 kw out
all day long. It comes
with a FCC approved input board, which has the input attenuators built onto
it, so it needs like 60+
watts to drive it to 1.5 kw. The attenuator is easily bypassed, then it
can easily be driven to 4 kw
out with just 20 watts..and more with a bit more drive. Also comes in
both a manual..and full auto
version..and both use a pair of chinese FU-728F tubes.
They also make a remote small console to remote the amp, if u want, cheap,
Emtron, when they were in business, also made a similar amp, same pair of
chinese tubes, and they rated
their version at 4.5 kw out.
## JA6TAY, from bear-el now has a separate company that mass produces
his 160-10m, 3CX-3000A7
commercial amp. 5++ kw out with just 200 watts of drive. Looks sorta
like a Henry radio 8K ultra.. but
actually built correctly. RF deck + B+ supply etc, sit in a 100 kg
box..complete with 7.5 kva CCS xfmr.
Small box in shack contains the myriad of pre-sets, and fine adjustment
tune control etc, + 5 x panel meters.
2nd item down.
I have all the schematics for it. Uses a motor driven vac tune cap..and a
motor driven 10 kw rated
roller coil, then a myriad of vac relays to switch in various combo's of
fixed load caps. He ships a helluva lot of em.
## which UK socket do you have ? There is some outfit in the UK I believe
that makes quality SK-1320 sockets
for the bigger GG triodes...... at a relatively cheap price... like 188
Euro's... like $230 US funds. On a related note,
if the grid driven version of the socket is used... which is called a
SK-1300..and u try to modify it for GG, it can be done,
BUT, in addition to 4 x cu straps being installed, on edge, so not to impede
airflow, the 4 x small ceramic insulators
on the socket assy also have to be removed..and replaced with aluminum
threaded cylinders. If the al cylinders
are not installed, all hell breaks loose, and a parasitic will result. With
the 4 x al cylinders and 4 x straps, its rock
solid..and no suppressor required on the series of GG triode tubes that use
the SK-1320 socket.
http://www.aluminumspacers.com/ cheap source for solid AL spacers with a
hole down the center,,, or a threaded hole.
U can get virtually any OD + ID and any thread size..and also overall
length. Saves a lot of screwing about fabricating
them by hand.
Sri for the diatribe, but thats this weeks bits of latest info that I know
of. Only other recent news is the availability
of the teflon version of LMR-600. A buddy found a source, they typ come
in 17 ft lengths with type N connectors.
The Type Ns are tossed, and replaced with 7-16 din or .875 EIA flange
connectors. Typ used for rotor loops
----- Original Message -----
From: "Jim Thomson" <jim.thom at telus.net>
To: <amps at contesting.com>
Sent: Monday, August 06, 2018 12:29 PM
Subject: [Amps] Big HV Supply
> Date: Sun, 5 Aug 2018 15:46:55 -0400
> From: "Carl" <km1h at jeremy.qozzy.com>
> To: "John Keating" <john.keating at outlook.com>, "Jim"
> <jimw7ry at gmail.com>, "'Herbert Schoenbohm'"
> <herbert.schoenbohm at gmail.com>, "'Amps group'" <amps at contesting.com>
> Subject: Re: [Amps] Big HV Supply
> <All the big Amp Supply transformers were Dahl, some had a tapped HV
> <for the LK-550 and LK-800 and others were custom non advertised for the
> <3CPX800A7 LK-800
> <You would be surprised at how many went to 160M "big guns". There is
> <honor on that band any longer.
> ## How much power can u get out of a LK-550 or LK-800..with a big xfmr
> I dont even know what tube or how many many tubes were in those amps.
> What are we talking abt here, like 3 x 3cpx800a7s putting out 3.5 kw or
> what ?
> I wouldnt get wound up abt a lousy 3 – 4db esp on 160m band. IMO, they
> increase the limit on 160m. Thats one band where some extra.. oomph
> would work,
> esp with sky high noise levels. Noise level with typ ssb rx filter band
> widths typ results
> in high noise levels... making life a bitch on 160m ssb.
> Jim VE7RF
> Amps mailing list
> Amps at contesting.com
This email has been checked for viruses by AVG.
More information about the Amps