What I'm doing on a Rainy Day...

[KA3ZLR]

I waz a Buzy Boyski...

The Filaments are Lit....Yea......

[W2PFY]

3 each 813's?

[WA1GFZ]

Nice job!
Gee, I had the day off so I ripped my HPSDR rig apart and dropped in bigger power supply modules so I can add a third receiver module. I'll never run out of juice again with 5 volts at 9 amps.

[KA3ZLR]

Yup, three 813's I'm having an issue with the Rectifier board for Plate supply
not sure what's going on there. I'm thinking the step start is having problems..


But that's the fun of it when it's done it's done..

73
Jack
KA3ZLR

[WD5JKO]

Jack,

  I am envious. First off it doesn't rain here; severe drought in central Texas. The last significant rainfall we got was from a tropical storm last September. Ok, the 813's look like they are getting impatient awaiting the power supply.

  I wonder if you will run the tubes grid driven in linear mode? If so, I can see about 200 watts AM with a 20A driving the thing. The 813's will blush, but with forced air cooling, a 813 is good for about 70 watts apiece on AM linear operation. That is what I get from my Central electronics 600L (single 813) driven by a Retro75.

  Looks like you have had some domino diode failures. Those diodes seem to be two types. Any chance you want to share that circuit so we all can better understand why your having difficulty?

Jim
WD5JKO

[KA3ZLR]

Hi Jim,

 Well I hope you get some Relief soon we just got off a 3 week binge no rain
and severe sun it burned my garden flat...it rained again last night I just come
in from feeding the cats outside everything's wet..

The amplifier is grounded grid very simple it's the powers supply that's involved
I put stepstarts in there and I think there's some  issues. It has been sitting for
about 5 years now and I don't have a 220 Variac I wish I did so I took a chance
on plugging it in and turnen the knobs... the plate's just a 2000 volt transformer
with a full wave bridge with step start on the input and a relay interlocks with
another relay initiator inside the Amp box with a turn lock switch and it all has to
work sequentially. it's all for safety and if the Op don't know the sequence it
doesn't come on..this was built when my harmonics were little...had to watch out
for 3 sets of Little fingers back then I was putting in 12 hour days at Estes Express.

So, yesterday was the first time bringing it up and the Low Voltage 110 system
come right up, Filaments lit,tested the safety resets for grid and Plate overload all
relays worked just fine, initiated Plate voltage circuit and there was a snap and the
tranny started  Humming overload circuit clicked off and my safety system took over
powering down, it was Great My safety checks worked...

So I think Today I'm gona Order a whole new set of everything on the diode board
and get to taking apart the transformer input relays and see what failed..

Hey thanks for the interest mine is very basic I took it from one of Bill Orrs books
back then real simple basic 813 amp. but I added the safety interlocks.

73
Jack
KA3ZLR