[Johnson] Want Ranger pwr xfmr

[C E]

Did you ever consider trying on of the Hammond line of
power transformers offered by Antique ES or whatever
other supplier that might be out there? It would be
interesting. Also, P. Dahl produces repros of these
but expect to pay some $$$. Finally, G.K. Brown
advertised a rewind service for these units. Might be
the cost effective way to salvage that xfmr next to
finding a replacement from a junquer. Cal, N6KYR/8

--- John Lawson <jpl15 at panix.com> wrote:

> 
> 
>    Anyone happen to have a NOS or Good-Used Ranger
> power transformer for 
> sale?  I need one - or a Good-Used Ranger - or, a
> new hobby... ;}
> 
> 
>     After several hours on the bench last night - it
> is apparent why this 
> old girl was shelved - it came to me with a 5R4 in
> the HV socket, but the 
> fils didn't light, tho the tube was good. So sure
> enough - someone had 
> tied the 5V fil lines back, and there was a 10-ohm
> 10W resistor in series 
> with the B+ lead.
> 
>    I made a plug-in SS rectifier, installed it,
> switched the rig on - and 
> blew both diodes and both line fuses to little bits.
> 
>    Ok.
> 
>    So I restored the original circuit - there is a
> definite 'under-load' 
> short from the HV rect fils to the HV winding.
> 
>    Ok..
> 
>   Disconnected all that - the LV side works fine,
> Osc runs, buffer runs - 
> can 'zero-beat' to a receiver, frequency of VFO
> seems accurate.
> 
>   Ok...
> 
>   Tansformer voltage and resistance checks are
> within 10% of spec.
> 
> Ok....
> 
> Put new diodes in put a Variac and ac ammeter in the
> mains line, turned it 
> up slowly - POW.  Actually, with the diodes in
> cicuit, it appears to the 
> Variac / AC Ammeter that the power transformer has a
> dead short. Having 
> replaced the filter caps, and checked the plate
> choke - it ain't them. The 
> B+ line resistance is slightly over 20K.
> 
> Ok.......!
> 
>    In this process the power transformer has begun
> to get slighly warm, so 
> I went back to checking the LV side - as I was
> testing, the transformer 
> started to arc internally - and resistance
> measurements now show the 
> fil-to-HV short.  So: It's toast.
> 
> 
>    While working on it, I did get to listen to a
> wonderful, hours-long AM 
> QSO on 3.885 - altogether seven or eight stations
> from both coasts and the 
> midwest - nice loud sigs, band wide open and quiet -
> little QRN and no QRM 
> (for once)
> 
> 
> NOW: Today I'll try and get the Valiant healthy.
> 
> 
>     What else are 4-day weekends for???
> 
> 
> Cheers
> 
> John  KB6SCO
> 
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