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?
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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