General Radio Co. Standard-Signal Generator Type 403-O

Pricing & History

Sold for
Start Free Trial or Sign In to see what it's worth.
Sold Date
Source eBay

This is a rare1920's General Radio Company AM broadcast band early battery operated signal generator. This was a top of the line piece of equipment in its day and its craftsmanship is really beautiful inside the cabinet. It needs an "A" battery of 1 1/2 volts filament for the two #12 vacuum tubes and it also needs about 45 and 65 volts "B" batterys to operate. (this is clearly marked) Its output into my Helper RF millivoltmeter read about -20 dbm output to the attenuator which agrees with the attenuator dial maximum on the front panel. Its internal AM modulation also works and has an input for external modulation. It has some minor cosmetic blemishes on cabinet but is really nice for being about 80 years old. T is also a small amount of battery corrosion in the stainless steel battery tray under the chassis. This would make for a nice antique test bench item or to go with your nice radios on display, or even a great gift or donation to that antique radio club. (See Pictures) This will be "sold as" is but is as described. Will ship only to the USA. This will weigh about 48 pounds and I will charge additional $20.00 for packing materials and double boxing. I will ship UPS ground insured. If arranged before hand you could possibly local pick up in Western Massachusetts. E-Mail if you have any questions. Please, serious bidders only. read more

Items in the Price Guide are obtained exclusively from licensors and partners solely for our members’ research needs.

Flag item for content or copyright

If this item contains incorrect or inappropriate information please contact us here to flag it for review.

If you are the originator/copyright holder of this photo/item and would prefer it be excluded from our community, contact us here for removal.