24 Volt Transformer Recommendation

[Dave]

Need 24v transformer for Philly supply, what would you use ?

[Norman S Braithwaite]

"Control transformer", the largest one that will fit under the chassis and make reasonable use of the original mounting holes (adapter likely needed).  Control transformers come in many sizes and styles.  I presume you have a remote control version of the Philharmonic.

Norman 

[Dave]

Thanks Norman. Yes plenty of 24v stuff out there, likely use Hammond for price and availability. Yes again on this, a BOL with remote. The selectivity switch that bumped phono input had been replaced and from all the schematics I’ve concluded this set was likely built with a turntable atop that had the “selector” switch in its bay, supplemented with remote control, however redundant. I am not sure this particular radio would ever have switched from front dial, perhaps the switch is original ? Without the remote or table, plan is to send 24v thru the Jones as original and use the switching solenoid to move between operations. This will require a 2way switch be used and likely mounted inside receiver bay, though I could use the side cabinet mount as this was a Pointer cabinet earlier in life. It will,take some finessing as we don’t want solenoid seeing full current except during switching cycles. I think there’s a switch that’ll accomplish “off” with radio and phono full up or down. Hope somehow this makes sense.

[Norman S Braithwaite]

Switching between radio and phono on the remote control Philharmonic was indeed interesting.  A local remote keyboard was required and provided for this operation.  I think your approach is more practical.

Norman

[Dave]

Just what I needed to hear Norm. Mine is dated 39, not sure of chronology but as ordered it’s safe to say this “XX” rendition at the cusp of FMs that predicate, it’s an odd duck. Based on findings within the chassis, there’s no evidence that manual switching took place anywhere but from the phono bay. I’m not sure how the actual remote electrically interfaced other than momentary but somehow it affected the switching solenoid but only after the set was turned on in the phono bay. I could be all wet, by “locale” Remote you are referring to that which was tethered thru the Jones plug, correct ?

[Norman S Braithwaite]

Yes.  The Jones plug would have been one of two or more that connected to a junction box at the radio (phono version only).  The phonograph included a remote operated motor to operate the off-start-reject selector mounted to the plinth.  I have a spare remote operated Scott labeled Garrard RC-6 here but I have not inspected it for viability of restoring function.  I have three others (two manual and one remote) that I have been able to restore to functioning condition.  The RC-6 seemed to survive better than some other pre-war Garrard models.

Norman

[David C. Poland]

Dave - to clarify, the 24 volt transformer was mounted inside the amp, using the 4 holes on the side apron about mid way, and opposite the side with the cable sockets.

Your amp should have a cable socket to fit a 4 pin plug from the 2nd receiver cable.  Two of the pins carry one leg of 117 AC to the receiver's power switch and back to the amp. For a remote control Philharmonic (or remote control Phantom), the other 2 pins carry 24 volts AC in that cable to the receiver from the 24 volt transformer.

 

[Dave]

Yes David, I misspoke perhaps, 24v thru the 4pin octal at ps rear. As with remote we’ll use the Jones harness to intercept functions via a toggle of sorts, this way things will look rather original if only for the toggle mount.
Because I have the Pointer cabinet with plugged side hole, I might execute switch there. On the other had I may leave it BOL correct and mount obscurely in the receiver bay.
Norm, I knew this was an odd duck,
though your “phono only” comment draws a blank. If you would have an option to avoid creating a “switch”, I’m all in.

[Norman S Braithwaite]

"Phono only"...  Irrelevant!  I intended "remote version only" as operation of the phonograph on non-remote versions was from the switch on the plinth.  But, of course, we are discussing the remote version.

Norman