Hi All,
I have a few N.O.S. RCA UY-227 tubes. Is there any use for these anymore or am
I holding onto them for no good reason? Are they worth anything at all? I think
that several years ago, I heard them referred to as "heater" tubes. I didn't
know that anything got hotter than a good old metal 6L6 tube....
rgds,
Mark S.

any version of the type 27 tubes are very common and were used mostly in
1928-1930 era AC radios. They can be used as audio drivers, which is what
they were in radios. However, the audio community doesnt think much of
them, at least today.
Used, tested ones sell for $5 or less each, usually. Also common from that
era is the UY-224 (24A).
Mark Oppat
Antique Audio


"Nc183d" wrote in message
...
Hi All,
I have a few N.O.S. RCA UY-227 tubes. Is there any use for these anymore
or am
I holding onto them for no good reason? Are they worth anything at all? I
think
that several years ago, I heard them referred to as "heater" tubes. I
didn't
know that anything got hotter than a good old metal 6L6 tube....
rgds,
Mark S.

any version of the type 27 tubes are very common and were used mostly in
1928-1930 era AC radios. They can be used as audio drivers, which is what
they were in radios. However, the audio community doesnt think much of
them, at least today.
Used, tested ones sell for $5 or less each, usually. Also common from that
era is the UY-224 (24A).
Mark Oppat
Antique Audio


"Nc183d" wrote in message
...
Hi All,
I have a few N.O.S. RCA UY-227 tubes. Is there any use for these anymore
or am
I holding onto them for no good reason? Are they worth anything at all? I
think
that several years ago, I heard them referred to as "heater" tubes. I
didn't
know that anything got hotter than a good old metal 6L6 tube....
rgds,
Mark S.

In article ,
(Nc183d) writes:

I have a few N.O.S. RCA UY-227 tubes. Is there any use for these anymore or
am
I holding onto them for no good reason? Are they worth anything at all? I
think
that several years ago, I heard them referred to as "heater" tubes. I didn't
know that anything got hotter than a good old metal 6L6 tube....

The '27 was the first commercial indirectly-heated cathode (hence "heater")
triode, as opposed to tubes whose filament emitted the electrons (26, 45, 71A,
etc.).

A 27 doesn't get very hot. They make good audio preamps and drivers (in late
1920s to early 30s radios) and also RF amplifiers and above all, oscillators in
superhets.

They're common enough not to be worth a lot, BUT, since you mentioned "UY", you
probably have the "globe" or "ballon" shaped glass envelope, which makes it
more valuable (maybe $10) to an antique radio restorer, who wants the vintage
look. I really love that old glass shape.

Anyway, try to sell them to a vintage radio guy. Advertize them in
rec.antiques.radio+phono, or put them on eBay. --Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.

In article ,
(Nc183d) writes:

I have a few N.O.S. RCA UY-227 tubes. Is there any use for these anymore or
am
I holding onto them for no good reason? Are they worth anything at all? I
think
that several years ago, I heard them referred to as "heater" tubes. I didn't
know that anything got hotter than a good old metal 6L6 tube....

The '27 was the first commercial indirectly-heated cathode (hence "heater")
triode, as opposed to tubes whose filament emitted the electrons (26, 45, 71A,
etc.).

A 27 doesn't get very hot. They make good audio preamps and drivers (in late
1920s to early 30s radios) and also RF amplifiers and above all, oscillators in
superhets.

They're common enough not to be worth a lot, BUT, since you mentioned "UY", you
probably have the "globe" or "ballon" shaped glass envelope, which makes it
more valuable (maybe $10) to an antique radio restorer, who wants the vintage
look. I really love that old glass shape.

Anyway, try to sell them to a vintage radio guy. Advertize them in
rec.antiques.radio+phono, or put them on eBay. --Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.