[Central-Electronics] Fwd: Re: 6550

[Gordon]

Jim,
  I removed RFC-1 and now I get 75 watts out on 75 meters. but as I go
higher, each band puts out a little less.
I think I should be looking for a bad Cap at this point, as removing the
inductance made more power.
Another Question, What is up with the little Coax Capacitor thing coming
off the Band coupler Wafer?
    I think Tomorrow, I am going to strip everything out from below the
Finals cage and replace each and every part.
Another clue might be that my Watts meter shows a reading in transmit,
even with the Carrier and Power control at fully counterclockwise, and
the Pot for the Watts turned down as far as it will go.
I should not be showing anything when there is No output and all
controls at minimum. I even get a Watts reading in SSB with No carrier
and no Mic connected...

73,
Gordon
N6WK

On 7/24/2013 7:23 PM, Jim Candela wrote:
>
> Gordon,
>
> "At first I thought it might be the RFC-1,  mine shows 2.3uH when measured out of circuit"
>
>    Looking at the schematic, RFC-1 says .022mh. This converted to uh is 22uh. I'd remove that part temporally and run up the drive. This might explain why you have more power output with increasing frequency.
>
> Jim
> WD5JKO
>
>
> ________________________________
>   From: Gordon <gordon at n6wk.com>
> To: central-electronics at mailman.qth.net
> Sent: Wednesday, July 24, 2013 6:25 PM
> Subject: Re: [Central-Electronics] 6550
>
>
> 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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