02-06-2023, 07:52 AM
Hi Tiddat,
Welcome to te Phorum!
The 80 is likely OK. The voltages are high due to a low current draw. These power supplies always run higher when there is no "load" connected to it. Therefore, the issue is that there are circuits that are not drawing what they should.
http://www.nostalgiaair.org/PagesByModel...029653.pdf
According to the above schematic, there should be about 160V on the plates of the 71A Output tubes. If that value is high, the 71As may be bad, and may be the reason for the low volume. I fixed a Gloritone several years ago for a friend with the same symptoms. Audio output was a single '45 tube. When replaced, issue was solved. Radio played loud and proud and B+ voltages returned to normal.
This radio needs a rather long antenna. This is a "TRF" set, very similar to Atwater Kent and RCA TRF sets of the period, except that this et has a Push Pull output which gives superior, lower distortion sound. Unfortunately, the grid leak detector used in this set gives higher distortion than a diode detector. This set may also employ the "Neutrodyne" circuit, and unlike the Radiola 16, 17, 18 and the A-K 5, 40, 35c, the first RF stage is tuned.
This set does have a built in "local" antenna (Capacitive coupling to AC Line. However, ensure that the capacitor 33 is new and of a "Safety" type.
Welcome to te Phorum!
The 80 is likely OK. The voltages are high due to a low current draw. These power supplies always run higher when there is no "load" connected to it. Therefore, the issue is that there are circuits that are not drawing what they should.
http://www.nostalgiaair.org/PagesByModel...029653.pdf
According to the above schematic, there should be about 160V on the plates of the 71A Output tubes. If that value is high, the 71As may be bad, and may be the reason for the low volume. I fixed a Gloritone several years ago for a friend with the same symptoms. Audio output was a single '45 tube. When replaced, issue was solved. Radio played loud and proud and B+ voltages returned to normal.
This radio needs a rather long antenna. This is a "TRF" set, very similar to Atwater Kent and RCA TRF sets of the period, except that this et has a Push Pull output which gives superior, lower distortion sound. Unfortunately, the grid leak detector used in this set gives higher distortion than a diode detector. This set may also employ the "Neutrodyne" circuit, and unlike the Radiola 16, 17, 18 and the A-K 5, 40, 35c, the first RF stage is tuned.
This set does have a built in "local" antenna (Capacitive coupling to AC Line. However, ensure that the capacitor 33 is new and of a "Safety" type.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
