Robyn radio

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Posts: 70
Joined: Fri Dec 01, 2006 11:34 pm

Robyn radio

Post by WB8JBG » Wed Apr 15, 2009 11:16 pm

I have just aquired a Robyn Transceiver model 500a. I bought it from a old time ham who swears it is a ham radio. It shows on the selector swicth 10 thru 80 meters, AM SSB and CW. Looking inside the rig it appears that all bands are connected to the band swicth. I haven't been able to test it because it appears to have some bad caps in the power supply. Anyone ever heard of Robyn making a ham rig. On the plate it says made for Robyn radio and gives the address and under neath it says Japan???????

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Joined: Thu Jul 10, 2008 9:27 pm

Robyn 500a = ?

Post by NM7L » Thu Apr 16, 2009 2:19 am

Yep, Robyn did make a HF Transceiver...but it was better known (?) here in the USA by another "well-known for their CBs" manufacturer. The Robyn 500a is better known as (drum roll please....) the SBE SB-36!

You can search online for info on the SB-36. There is one website, ... ual-00.pdf that will provide you with a manual for the '-36: should work for the 500a as well.

Gotta love those old Nixie tubes for frequency readout!
"These floors are dirty as hell...and I'm not gonna take it anymore!"
- Stanley Spudowski
U-62 Custodial Lead

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Location: Grant Valkaria, FL

Robyn Digital 500

Post by K4JC » Tue May 05, 2009 6:44 pm

Yes indeed, the Robyn Digital 500 is a ham rig. I had one as my first HF transceiver back in the '70s. The one I had worked OK on most of the bands, but a previous owner had butchered the 10 meter PA section, probably trying to convert it to CB. It wouldn't generate more than a hundred milliwatts on 10, but one afternoon while trying to work on it (yes it was connected to an antenna - bad ham!) someone heard me testing and called me. It was a W5 in New Mexico; I was in Maryland!

I thought they were all pretty much gone, but it looks like there are still a few floating around.

JBG if you decide to sell yours let me know!

Posts: 70
Joined: Fri Dec 01, 2006 11:34 pm


Post by WB8JBG » Wed May 06, 2009 5:28 pm

I have the schematics and I am working on it. The relay is bad in the power supply, however I think I have a replacement in my junk box. The power supply works as far as I can tell, I shorted the relay and the fan came on, but no filaments. It will take awhile but when it is up and running I will sell it. I'll let you know.

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