Antique radios, Old Time Radios
AY227
|
Country:
United States of America (USA)
|
|
| Identical to |
AY227
= UY227
= AY225
= MY227
|
| Similar
Tubes |
Other base:
UX225
|
| First year |
1927
Saga of the Vacuum Tube, Tyne page 320
|
| Predecessor Tubes |
UX225
|
|
|
 |
|
AY227: ARRL Handbook 1972
Michael Schlör
|
| |
from Just Qvigstad
|
|
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