O.T.....really OT...

[orange_glow_fan]

Hi Guys,

 Need to replace the vibrator based DC-DC 'converter' in an OLD (1952) Grundig car radio (in a Mercedes) I'd like to use something more modern..and reliable! The vibrator is a 5 pin version that I am unfamiliar with and I'm guessing it's made out of 'unobtanium.'.. (might be synchronous?)

 The board needs to supply around 225vdc. to a 5 tube radio. (no need to supply the filaments) The rub is that the car is 6 vdc. Is there anything on Ebay (or??) that would work? 

I've included the schematic for informational purposes...

[Bill Stanley]

Looking at the schematic, the car 6V power (assumed negative ground) feeds the center tap of the step-up transformer. The 2 "outer" windings are connected to the 2 poles of the vibrator. First guess is that the vibrator alternately grounds the 2 sides of the primary with a square-wave alternate phase signal that is stepped-up by the transformer to around 220V. You could build a 2 transistor + osc (555) into the existing can (figure out the frequency so the transformer isn't too unhappy. If shoot-thru is a problem, a small PIC could generate any signal needed.

  Don't know if this helps (no direct cross) but a quick email may yield something.

http://www.royalsignals.org.uk/vibs/

  -Other Bill-

[David Speck MD]

A quick eBay search for "radio vibrator replacement" returns a number of
possibilities, mixed among the s*x toys.

I saw some 12 volt solid state replacements, and a number of  5 volt
mechanical, original equipment ones.

The dyed in the wool old car enthusiasts want only the gen-u-wine
original mechanical ones that whine, not the solid state ones.

Dave

> --

[Instrument Resources of America]

See if these folks can help      ANTIQUE AUTOMOBILE RADIO, INC., 700 Tampa Road, Palm Harbor, Florida 34683
Toll Free 800 933 4926 | (727) 785 8733
sa...@antiqueautomobileradio.com 

Standard disclaimer. I have no connection what so ever to them.                        

Ira

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[blkadder]

I have dealt with these guys when I was re-wiring my 65 MGB.  They are great guys to work with and they will help you out if they can.

Ron

On Friday, June 21, 2019 at 9:29:16 PM UTC-4, I wrote:

See if these folks can help     

ANTIQUE AUTOMOBILE RADIO, INC., 700 Tampa Road, Palm Harbor, Florida 34683

Toll Free 800 933 4926 | (727) 785 8733

...@antiqueautomobileradio.com 

Standard disclaimer. I have no connection what so ever to them.                        

Ira

On 6/21/2019 2:46 PM, 'orange_glow_fan' via neonixie-l wrote:

Hi Guys,

 Need to replace the vibrator based DC-DC 'converter' in an OLD (1952) Grundig car radio (in a Mercedes) I'd like to use something more modern..and reliable! The vibrator is a 5 pin version that I am unfamiliar with and I'm guessing it's made out of 'unobtanium.'.. (might be synchronous?)

 The board needs to supply around 225vdc. to a 5 tube radio. (no need to supply the filaments) The rub is that the car is 6 vdc. Is there anything on Ebay (or??) that would work? 

I've included the schematic for informational purposes...

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