Prestotune 12 Ch= 1217 tall console

Crosley Radio Corp.; Cincinnati (OH)

  • Year
  • 1937/1938
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • ID
  • 36195

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 12
  • Main principle
  • Superhet with RF-stage; ZF/IF 455 kHz
  • Tuned circuits
  • 8 AM circuit(s)
  • Wave bands
  • Broadcast, Short Wave(s) and Police.
  • Power type and voltage
  • Alternating Current supply (AC) / 110; 220 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Wooden case
  • from
  • Model: Prestotune 12 Ch= 1217 [tall console] - Crosley Radio Corp.;
  • Shape
  • Console with Push Buttons.
  • Dimensions (WHD)
  • 28.7 x 42.7 x 14.5 inch / 729 x 1085 x 368 mm
  • Notes
  • Cabinet 7PF. Pushbutton motor tuning. Wavebands: 535 - 1725 kHz, 2.0 - 6.8 MHz, 6.6 - 22 MHz. Early models had non-locking pushbuttons, later model had locking pushbuttons.

  • Net weight (2.2 lb = 1 kg)
  • 31 kg / 68 lb 4.5 oz (68.282 lb)
  • Price in first year of sale
  • 138.00 $
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 10 = 1939 and before
  • Literature/Schematics (3)
  • Crosley Folder No. 1918, 1938 for Season 1937/38.

 Collections | Museums | Literature


The model Prestotune 12 is part of the collections of the following members.


Forum contributions about this model: Crosley Radio Corp.;: Prestotune 12 Ch= 1217

Threads: 4 | Posts: 33

Hello dear Radio Collectors.  I have decided to make little station labels to go on the eight preset buttons of this radio.  Check out my first try at this:


I have two questions:

1. Does anyone know what AM stations might have been on the air in the New York region when this radio was new (1937)?  I prefer having historical names to just using whatever local stations I can receive today.

2. I have created a template that fits these buttons.  It is in CorelDraw (.cdr) format.  Using this, it is very easy to type in any station call letters and print them in the correct size.  Do we, in RMorg, have any provision for uploading this type of file and keeping it associated with the model?


Michele Denber, 14.Mar.09

Weitere Posts (4) zu diesem Thema.

Thanks to everyone for their help with this radio.  I ended up replacing all of the electrolytic and paper capacitors.  That fixed the excessive current draw but there was still no output. I then replaced the audio amplifier tube which restored normal operation.  The radio now works and sounds great.  Except for one problem: occasionally, at some random times, the volume will suddenly drop almost in half.  Then it will play that way for a while and then it will pop back up to the original level.  That cycle continues to go on as long as it's on.  What on earth could be causing this?  It's hard to trace, because most of the time it is working OK.  I have checked all of the tube connections and switch contacts.  They seem to be OK.  I'm not sure where to begin and would appreciate any advice.  Thanks und danke schoen.

          - Michele


Michele Denber, 13.Jan.09

Weitere Posts (14) zu diesem Thema.

OK, I have another question now.  I'm not at all familiar with these old style molded capacitors.  The capacitor on the left in mounted upside down, so it reads black-brown-red (you can see the arrows indicating this).  The other one is black-green red.

Now, what are the values?  According to a table I found on the web, the black-brown-red should be 0-1-00, or 100, and the other one is 500.  But what are the units?  Is this 100 and 500 uF, nF, or pF?

Also, does anyone have an opinion on the reliability of these components?  If they read OK, should I just leave them alone?  Are they more reliable than paper capacitors?  Any help would be most appreciated.  Thanks!


Michele Denber, 18.Dec.08

Weitere Posts (7) zu diesem Thema.

Hello dear collectors.  I am restoring a Crosley Prestotune 12 (ch. 1217).  While replacing capacitors, I came across C16, a 40 uF can which sits behind the 1st IF can and just to the left of the 6K6 oscillator.  I found that it had already been snipped out of the circuit, so I don't know where the wires originally went (see circled part below):

Now here's the mystery.  If you look at C16 (circled in red below) and trace its connections in both directions (yellow traces), you see that neither end is directly grounded.  And yet my actual component has only one solder connector on it (ground being through the can to the chassis).

So I have a C16 that has to have one end grounded according to the actual radio I'm working on, but neither end is grounded according to the schematic.  Is the schematic wrong?  Am I wrong?  Any ideas?  Thanks very much!

Michele Denber, 12.Dec.08

Weitere Posts (8) zu diesem Thema.