[Central-Electronics] 6550

[Gordon]

Hi George and the Group,
George, I have double checked everything you mentioned..Same results.
  I tried the new tubes, and as everyone said,  They are NOT the problem.
I do have a question though. If I disconnect the Coax from the last 
wafer that goes to the RF Sampling circuit and the SO-239 connector, 
Connect my MFJ-259 to the loose end of the Coax  , with a 50 Ohm load in 
the SO-239, shouldn't the MFJ-259 show 50 ohms? Mine is no where near 50 
ohms. If I check the dummy load by itself, it is exactly 50 ohms.
The only thing on that Coax is the Amps Sampler for the RF output and 
the SO-239. At first I thought it might be the RFC-1,  mine shows 2.3uH 
when measured out of circuit, So it appears to be good.
I also noticed that the Neutralizing Cap is NOT shown on the 100V 
Schematic I have in front of me.

Gordon
N6WK



On 7/24/2013 9:48 AM, George Maier wrote:
> Hi Gordon:
>
> Great job on the 100V; glad to see so much enthusiasm for such a worthwhile
> project.   Not sure why you are having the RF O/P problems, but your coupler
> sequence is correct, and the voltages all seem within limits.  Not sure what
> you've done electrically, but here are a few simple things you may want to
> consider, if you have not already addressed them.  If you have, please
> ignore my drivel:
>
> 1 - Remove each coupler and apply a high quality contact cleaner to the base
> pins and the tap connectors; i.e. - Caig Pro-Gol applied with a q-tip or
> Caig pen.
> 2 - Same exercise for all of the of the lower stage coil banks, which are
> all removable.
> 3 - Be sure to replace the 100 mf - 15V cap (C418) across the PA screen over
> current relay; they're almost always bad. Also, burnish the relay contacts.
> 4 - Check the 10 Ohm resistor (R450) that is in series with the power
> control,  to make sure it's not open., and also the rest of the surrounding
> connections and circuitry.
> 5 - Remove all of the chassis interconnecting plugs (carefully) and clean
> them with Pro-gold also.
>
> Those steps should help to eliminate any flaky stuff, unless of course you
> do have bad tubes along the line.  Generally, I agree with the other folks
> here, that the PA tubes do not usually fail totally, but hey, it's certainly
> possible.
>
> Keep chugging, Gordon; you'll get there!
>
> 73, George - W1LSB
>
>
> -----Original Message-----
> From: central-electronics-bounces at mailman.qth.net
> [mailto:central-electronics-bounces at mailman.qth.net] On Behalf Of Gordon
> Sent: Tuesday, July 23, 2013 9:02 PM
> To: central-electronics at mailman.qth.net
> Subject: Re: [Central-Electronics] 6550
>
> I am still fighting the no to Low output on my CE-100V.
> I have ordered new 6550 tubes, but now I am thinking they are nt the
> problem. The tube tester shows both as very strong I am now wondering if
> someone has mixed up the Broadband output Coils.
> Can anyone tell me what color is correct for each band?
> I have Red for 80, yellow for 40, green for 20, blue for 15 and slate for 10
>
> Is this correct?
> I have now discovered that I get more output as I move up in bands. I get a
> whole 12 watts out on 20 and 15 meters..LOL Is there a way to test the
> center Frequency of each of these broadband output coils?
>
> Thanks,
> Gordon
> N6WK
>
>
>
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