Golborne Vintage Radio

Hi.
I see there are 1J26A Rod pentodes for sale on Ebay.
This is a new one on me and they date from 01/1988

Interesting as the anode is on the base.
Quite pricey though.

I saw those too, yesterday!

But I've not found any data as yet...

Seems like it was a forerunner to this https://www.radiomuseum.org/tubes/tube_1j36b.html

Hi.
I wonder though as these are dated 1988. Surely if they were replaced production would have ceased?
1988 is late for really any Rod Pentodes. They are discribed as current amplifiers, probably good for AF & RF output. Maybe worth a punt.

I do have a little information which I attach but obviously not original Russian. They are a bit expensive so I will leave it to others. I have noticed recently that prices are going up a bit but I suppose it is to be expected. I will blame you though Trevor for distracting and tempting me to have a look around to see waht is currently available 

Tracy

(09-09-2021, 05:54 AM)Amie Wrote: [ -> ]Seems like it was a forerunner to this https://www.radiomuseum.org/tubes/tube_1j36b.html

Hi Amie! Thanks for that, as it happens I'd found the link (Google is my friend!) but little in the way of data. I was put off by the idea of them being short-lifetime (not a problem in the target application obviously)...

Thanks also for the shortform data sheet Tracy. I'm saving that!

Well I've ordered 4.
Life won't be an issue for anything we do.
They might be a good option for a QRP transmitter.
Should be here early in October.

(10-09-2021, 08:50 AM)Murphyv310 Wrote: [ -> ]Well I've ordered 4.
Life won't be an issue for anything we do.
They might be a good option for a QRP transmitter.
Should be here early in October.

It's true about the life as, no matter how short it's stated as, being ex military they were designed to work perfectly for their predicted life which is usually longer than we use them. It's a bit like hams and their transmitting valve life in comparison to general service life although there are quite a few ifs and buts there maybe. It will be interesting to hear how they go. If it's the same seller they have some quite interesting things for sale. Your initial post has not tempted me to these but I am looking a bit at other things. I may not have many radio's but I am steadily collecting valves lol

Tracy

Rod pentodes were made up till the USSR ended. Some older types had production as replacement parts, often more than really needed.
It looks like it's medium power, between the 1j24b and 1p24, likely about 125mA @ 1,2V filament. Almost certainly for proximity fuze rather than a radio. Lower filament power than the 1p24 which is about 220mA, but it's for serious transmitters.

I'd think the 1j29b family is more use as a QRP.

https://pogorily.livejournal.com/47454.html
https://fido7.su.hardw.schemes.narkive.com/IoTwMdnE/14
https://mobylplus.ru/lampa-1zh26a.html Though shows a top anode wire

Polish
https://pl.wikipedia.org/wiki/Lampa_pr%C4%99cikowa

The 1j25r is very odd having only one half of the rod pentode and bottom anode.
https://www.radiomuseum.org/tubes/tube_1j25r.html

Operational life may have been rated in minutes for high power proximity fuzes, i.e. a kind of radar on bombs, shells and missiles, but in excess of life of normal 1.4V battery valves at more modest anode current and voltage, when run off 1.2V filament supply.

Some history
https://web.archive.org/web/201308110801...ost/355851