Radio Road

FM stereo lamps

71.63.69.67

dgaapc7

My Mac 1500 has good dial lights, with a nice, bright FM beacon. It comes on when I power it up, but goes out after a bit. Is this normal? I'm not playing the FM section these days. Does that matter?
LowIQ

Edits: 09/16/24

Follow Ups:

It sounds normal to me if you are NOT using the FM section. See what happens if you use FM. )MT( - J. S. Bach 15:17:06 10/26/24 (0)
Later Gator,
Dave
I converted my old tuner to use white LED lamps - jedrider 12:50:07 09/20/24 (0)
to light up the display. You need to find out the lamp voltage and the current you want for the white LEDs. You need to use a soldering iron. A display lamp dimming after warm up seems like a bad connection or resistor somewhere. You will need a volt meter to probe.
Wow, a Mac 1500 is Old!
Solid State preamp, Vacuum Tube power amp.
Watch out for those high voltages. Get an amplifier Tech to look at it or wire your own USB/LED lighting system if that is the only thing bothering you. You could use a wall wart and just power a pair of LED with a pair of wires.

Edits: 09/20/24
RE: FM stereo lamps - 6bq5 12:13:58 09/16/24 (0)
An older Mac unit- could be a myriad of issues-
Try to P/U a service manual from Audio Engine-
Could be a component in the lamp circuit
In thinking further-
When was the unit last aligned?
It could also be a case of the tuning circuit drifts as the unit warms up causing the tuner to drift off center tuned...
Happy Listening

Edits: 09/17/24

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