[Milsurplus] Vibrators

[Tom Norris]

Any decent diode that will do a couple amps. I think.
The power supply is apparently complex in order to operate
the set from so many different voltages - 6,12,24 VDC and
120 VAC. When operating from dry batteries, the power
supply is pretty much bypassed.


>Speaking of GRR-5,what is a good diode to use to replace the 
>seleniums with?And why design a radio set with a power supply more 
>complex than the radio?
>  Jay
>
>-----Original Message-----
>From: milsurplus-bounces at mailman.qth.net
>[mailto:milsurplus-bounces at mailman.qth.net]On Behalf Of Tom Norris
>Sent: Wednesday, June 02, 2004 10:16 AM
>To: milsurplus at mailman.qth.net
>Subject: Re: [Milsurplus] Vibrators
>
>
>Which reminds me, is there a noninvasive way of "solid stating"
>the GRR-5 receiver power supply and still have it work on the
>stock range of voltages?? I love to hear the vibrators hum, but
>some day they might refuse to do so.
>
>Tom NU4G
>
>>
>>
>>My empirical experience indicates something on the order of half a century of
>>no use before the contacts don't (make contact).  Ten years ago and back, the
>>Korean War vintage ones virtually always worked out of the box and most makes
>>of WW-II ones didn't.  Recently (last couple of years at least), Korean War
>>ones usually do not work out of the box.   And for both groups, vibrators
>>installed in equipment that had been used (i.e., not also NOS)
>>were/are more likely
>>to operate without the contact clearance procedure than NOSB units.  So it
>>would seem to be elapsed time since last use more than absolute age that
>>determines the likelyhood of working on power up.
>>
>>BTW, yesterday I was in the neighborhood so I dropped by the place where we
>>found the receiving antenna multicouplers, but although they let me prowl the
>>aisles, they didn't have anything radio related.
>>
>>In a message dated 6/2/2004 10:07:04 AM Central Daylight Time,
>>gl4d21a at juno.com writes:
>>>   I recently reassembled a GE Progress Line mobile radio from 1954 for a
>>>   vintage police car restoration.  It uses the dual interruptor vibrator,
>>>   Mallory 1701 or equivalent.  Based on my previous experiences with
>>>   vibrators, I hardly expected to find an operational one, but the first
>>>   three I pulled out of the vibrator stash all vibrated on initial
>>>   application of power.  I did not try to decipher the date codes on them,
>>>   but they have been in dead storage for at least 20 years, so not all
>>>   vibrators die in storage from sulfur contamination of the contacts.  I
>>>   regret I did not record the manufacturers, but all 3 were different
>>>   manufacturers.  I shipped all of them to the restorer along with the
>>>   radio in case he gets serious about making the receiver work.
>>>
>>
>>Robert Downs - Houston
>><http://www.wa5cab.com> (Web Store)
>><wa5cab at cs.com> (Primary email)
>><wa5cab at houston.rr.com> (Backup email)
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