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#1
July 26th 08, 10:46 AM
posted to rec.radio.amateur.boatanchors
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HRO-50T1 Gear mech. question, etc.
I recently acquired an HRO-50T1. After a re-cap job, tubes, cleaning,
and a light alignment, it now works just fine. I have a question about lubricating the HRO dial mechanism. It seems to be dragging and mildly squeeks. Its not binding; it just sounds dry or something. Also, how the heck does one change the dial lights? It appears that a complete removal of the cabinet/front panel is required. Can anyone confirm this or know the real secret? Finally, I have a 50-1 book from one of the manual providers and it shown use of a 6SN7 in the audio chain. Mine has a 6SJ7 instead. Is my 50T1 receiver a later or earlier version of the 50-1 series? Thanks much. Jeep/K3HVG |
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#2
July 26th 08, 08:49 PM
posted to rec.radio.amateur.boatanchors
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HRO-50T1 Gear mech. question, etc.
On Jul 26, 3:46 am, k3hvg wrote:
I recently acquired an HRO-50T1. After a re-cap job, tubes, cleaning, and a light alignment, it now works just fine. I have a question about lubricating the HRO dial mechanism. It seems to be dragging and mildly squeeks. Its not binding; it just sounds dry or something. Also, how the heck does one change the dial lights? It appears that a complete removal of the cabinet/front panel is required. Can anyone confirm this or know the real secret? Finally, I have a 50-1 book from one of the manual providers and it shown use of a 6SN7 in the audio chain. Mine has a 6SJ7 instead. Is my 50T1 receiver a later or earlier version of the 50-1 series? ==================== The "T" in the model number indicates a table cabinet (rather than a rack mount version). So your 50T1 is in fact a 50-1 and is the later version with three IF stages. One section of the 6SN7 is used as a phase-inverter for the P-P 6V6 output tubes, the other section is used as a S-meter amplifier in both the late and early versions. The first audio amp is a 6SJ7 in both versions. Hope this helps. --Ed |
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#3
July 27th 08, 11:55 AM
posted to rec.radio.amateur.boatanchors
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HRO-50T1 Gear mech. question, etc.
Ed Engelken wrote:
The "T" in the model number indicates a table cabinet (rather than a rack mount version). So your 50T1 is in fact a 50-1 and is the later version with three IF stages. One section of the 6SN7 is used as a phase-inverter for the P-P 6V6 output tubes, the other section is used as a S-meter amplifier in both the late and early versions. The first audio amp is a 6SJ7 in both versions. Hope this helps. --Ed Ed, Thanks for the clarification. One likes to know the chronology of models these radios. 73 Jeep K3HVG |
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