[hollowstate]

Hi all:
I acquired a PAIR of 39-55s (sans mystery remotes and all tubes, waah) a few months ago, which were literally waiting at the curb for the trash. Now, having read a few things about the operation and alignment/repair of these units, it seems to me a good idea to get the main radio portion functioning first, then tackle the remote receiver side. Therefore, has anyone got a 'tidy' way to operate the unit without the remote side? Could it be as easy as not installing the tubes for the remote rcvr? If so, then so much the better, as a full set of tubes is in the $100 ballpark - rather not have to buy them all at one time (not to mention 2 sets). As always, thanks in advance for all input.

Stirling KC0NXM.

[Ron Ramirez]

Wow, TWO 39-55 sets? Lucky you! Congratulations on your acquisition.

The radio will operate without the four tubes used in the Mystery Control section of the set. However, keep in mind that you will need to replace the motor run capacitor (59), because the off-on-volume control is operated by a motor - whether you use the Mystery Control remote or not. Also replace electrolytic (66) in the stepper circuit. In fact, you should go ahead and replace all of the paper and electrolytic capacitors, including those in the Mystery Control section, as well as any off-tolerance resistors; even if you do not plan on using the Mystery Control right away. This way, you won't have to go back into the set later on.

Cap (59) is shown as a conventional electrolytic on the schematic. It isn't! It should be replaced with a non-polarized unit rated at 30 volts or better. You might find an ideal replacement, a new motor run capacitor, at a motor rewinding shop.

Two tube vendors worthy of your consideration:

http://www.findatube.com/
http://www.vacuumtubesinc.com/

Both offer used as well as new tubes, and they stand behind what they sell.