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 Post subject: Re: A-K 44 In An Ornate Pooley Cabinet Followed Me Home Toda
PostPosted: Dec Sun 17, 2017 3:20 pm 
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The cabinet feet/legs have been disassembled, repaired and replaced. The cabinet is on a solid footing again. I gave the cabinet a good cleaning with Gojo, and have no plans to do anything else to it.

RMorg has an old Pooley advertisement for this model of cabinet.
Apparently Pooley referred to it as the "7500 Spanish Chest".

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Last edited by processhead on Dec Tue 19, 2017 1:32 am, edited 1 time in total.

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 Post subject: Re: A-K 44 In An Ornate Pooley Cabinet Followed Me Home Toda
PostPosted: Dec Sun 17, 2017 6:24 pm 
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Location: Morristown, N.J.
There's no need to bust up any tar to replace the caps. All of the supply access points are found outside of the tar. The middle of the attached drawing shows the position of the wires as they exit the tar. You need to simply cut some wires and connect the new caps. Even the filter chokes remain in the circuit. I usually place one filter cap on the 80 socket base, and the others fit under the interconnect board as I recall. I've done many of these AK bathtubs models 40 and up and never went into the tar. I have not done 37's and 38's so I can't confirm the access points.


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 Post subject: Re: A-K 44 In An Ornate Pooley Cabinet Followed Me Home Toda
PostPosted: Dec Sun 17, 2017 6:37 pm 
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Paul,
Did you notice the long narrow hidden compartment under the main chest portion? There should be a small knob in the center and the door hinges down. I can't see the knob in any of your pictures, but all of them I've seen had the hinged compartment. It took me a while on mine since the knob had been removed. I only found it while looking at it from the bottom, and saw a couple of small hinges.

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 Post subject: Re: A-K 44 In An Ornate Pooley Cabinet Followed Me Home Toda
PostPosted: Dec Sun 17, 2017 10:38 pm 
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atwaterkentsrus wrote:
Paul,
Did you notice the long narrow hidden compartment under the main chest portion? There should be a small knob in the center and the door hinges down. I can't see the knob in any of your pictures, but all of them I've seen had the hinged compartment. It took me a while on mine since the knob had been removed. I only found it while looking at it from the bottom, and saw a couple of small hinges.


Yes, it's interesting you mentioned that compartment Jimmy .
I was examining the back of the cabinet prior to purchasing it and notice the lid was missing from the chassis. Crap, I thought to myself.
Then I glanced down and saw the chassis lid just visible in the open back of that narrow compartment under a quarter inch of dust. Score!
The front door on the lower compartment has two knobs on this cabinet.
Are the legs solid on your cabinet? Mine needed a lot of gluing and clamping to get them them back together again but the rest of the cabinet is in excellent shape.

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Last edited by processhead on Dec Sat 23, 2017 1:38 pm, edited 1 time in total.

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 Post subject: Re: A-K 44 In An Ornate Pooley Cabinet Followed Me Home Toda
PostPosted: Dec Mon 18, 2017 12:58 am 
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Paul,
The legs on mine are pretty solid, however since someone removed the radio and guts, there is not a lot of weight there when compared to a complete unit like yours.

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Dec Tue 19, 2017 12:59 am 
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As was mentioned, the chassis was modified to work with the Sterling electrodynamic loudspeaker.

As I got into the radio chassis today, I figured out what they did to make it work. Basically they took the first two filter chokes out of the power supply circuit and replaced it with the field coil of the speaker. They also added a 8 uf filter input capacitor.

I marked up one of Leigh's modern schematics to show the modifications.

Attachment:
Modified AK-44 Schematic(reduced).jpg
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Last edited by processhead on Dec Sun 31, 2017 3:15 pm, edited 1 time in total.

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Dec Sat 23, 2017 1:49 pm 
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Well, I encountered the first major setback. I had tested the power unit transformer and had continuity through all the filament windings and the HV windings. I then unplugged the rectifier tube, the set connector removed, and I applied about 30 volts AC through my variac.
I measured normal open-circuit voltages on all windings. The HV windings were within a volt or two of each other with respect to the center tap.
At some point during the initial testing and replacing the filter capacitors, I lost one side of the HV transformer winding, an apparent open winding.
I am in the process of lining up a possible replacement.

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Last edited by processhead on Dec Sat 23, 2017 7:57 pm, edited 1 time in total.

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Dec Sat 23, 2017 6:53 pm 
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Beautiful console Paul and for fifty bucks! I am jealous.

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Feb Mon 05, 2018 2:47 pm 
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Just a follow up.
I was able to find a replacement power supply for the radio since the original had an open transformer winding.

I recapped the new power supply and modified it like the original to work with this radio's field coil speaker. This actually simplified the rebuild work since it eliminated the first two filter chokes.

The capacitor can on the radio chassis was also restuffed with replacement film caps and I replaced the grid leak resistor with a replacement discretely mounted under the chassis

The radio sounds very good and has great sensitivity, as do most of these radios when used with a good antenna and ground.

Here is a final picture of the finished chassis.

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Feb Mon 05, 2018 9:26 pm 
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Looks like your usual excellent work; nice going! :D

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Feb Mon 05, 2018 11:28 pm 
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Beautiful job!

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Feb Tue 06, 2018 2:38 am 
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Almost forgot to mention, with guidance from Norm Leal and dtvmcdonald, I was able to rewind the open line ballast resistor.

I found some constantine resistance wire on ebay, originally made in Austria and shipped from Bulgaria. Rewinding the ballast on the original ceramic form was just as easy as Norm said it would be.

I wound it with roughly 3 times the resistance of the original ballast, which compensated for the higher line voltage and keeps the power transformer running cool.

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Feb Tue 06, 2018 8:44 am 
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Now you need to fine the matching stool that goes with it.

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Feb Tue 06, 2018 2:13 pm 
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I am not sure this one was ever intended to be used with a stool. It is not a writing desk-style cabinet.
Maybe a stool to operated the radio from? :?

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...... how hard can it be?


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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Feb Tue 06, 2018 7:20 pm 
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Great job, Paul. Congrats.

- Leigh

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 Post subject: Re: A-K 44 w/Ornate Pooley 7500 Cabinet Followed Me Home Tod
PostPosted: Feb Mon 12, 2018 1:01 am 
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Good looking AK.

I bought one a few years ago and the metal radio cabinet is like brand new protected by the Pooley cabinet. Mine has the original AK speaker which has its original gold grill cloth intact and perfect behind the grill cloth in the pooley.

My Pooley has a drop down desk

I have never seen any other metal AK speaker with grill cloth.

The speaker is mounted with ears and does not have the base and this all looks like factory made.

Jim


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