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307A tubes

post #1 of 7
8/12/09 at 3:34pm
Thread Starter 
There appears to be only four brands of these available - Ken Rad,Sylvania,NU and Raytheon.Are there any others?

When did production cease on these? Most seem to be 1940's vintage
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post #2 of 7
8/12/09 at 4:17pm
There's also Western Electric.

Yes, they're all made in 1940's tubes other than NU is I'm not sure.
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post #3 of 7
8/12/09 at 11:09pm
These were military WWII radio tubes, and most are stashed in Europe - I've had good luck with one guy in France who lists them occasionally on eBay. Pete has an extensive discussion about the 307a (aka vt-225).

TubeData lists Western Electric also, but no idea who really manufactured, and who rebranded.
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post #4 of 7
3/25/10 at 9:00am
WE developed it, one of my favorite tubes It's pitty that 306A is so scarce ...

307A VT-225 DH Pentode

307a Single End Amplifier
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post #5 of 7
3/25/10 at 12:51pm
I know someone who has built a 307A based amp and he said that getting matched tubes was quite difficult. I hope TTVJ are keeping a stash for their customers!
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post #6 of 7
3/25/10 at 1:02pm
If you're "rolling your own" amp, probably be a good idea to find a substitute. The 10y is pretty close.
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post #7 of 7
9/10/11 at 9:53am

To all 307A VT-225 lovers ...

 

 

I had some time and I selected and took photos of all 4 types of 307A tubes I have. There is also Western Electric type in slightly different glass envelope.

 

 

307A National Union

 

307A Ken Rad

 

307A VT-225 Sylvania

 

307A RK-75 Raytheon

 

 

These days I expect to get Western Electric 307A and I'll post photos here ...

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