Don't I know it. When I wrote it 20 years was half my age and 20 years before I was in US Navy Electronics Technician A school. Now 20 years is 1/3 my age and I'm probably in the last 20 of my life.
Tuner Alignment for Dummies
- Thread starter DanTana
- Start date
Don't I know it. When I wrote it 20 years was half my age and 20 years before I was in US Navy Electronics Technician A school. Now 20 years is 1/3 my age and I'm probably in the last 20 of my life.
basically, anything going out of the genescope would be output of the freq. generator
anything into the genescope would be input to the oscilloscope.
this is true...until it's not
am and fm are done with the same gangs on this 1969ish Sears/Wharfdale/Rotel.
i am a novice tuner guy at best so maybe @Punker X could elaborate how common this is/was.
If by smaller you mean more fins closer together. Yes those are FM.
Not. Maybe impossible, more information please. Like make, and model.
sears model 570. rebadged wharfedale built by rotel.
5 fm presets on the left all have their own "mini" tuners. or press the manual button and use the full scale dial
You don’t need a genescope you need a sweep generator capable of 10.7 mhz.
Odd and have never seen this in anything that come across my bench. I have seen presets like this in a Meridian and something else that I can't remember right now. These were FM tuners. Were able to find a schematic for this unit?
nope. i wish that i could. it works fine. i'd just like the documentation.
Most likely a varactor tuner. No gang, per se - just a bunch of voltage variable diodes ganged to the same voltage, which is adjustable via each pot for each station as well as the "manual" tuning pot. The McIntosh MR80 is another example of a varactor-tuned tuner (although it doesn't have AM) tuned by preset pots as well as a main tuning pot.
Nope, that's the "main tuning" pot. The varactors and L/C adjustments are hiding under the shield. A varactor is just a diode that, when reverse biased, acts as a variable capacitor proportional to the reverse bias voltage. A critical component in RF synthesized oscillators, but you can tune them manually using a variable voltage like this receiver.
thank you! i had not even noticed those wires and the tuning pot until this convo started this morning.
one mystery solved.
This really deserves its own thread. Wow.
if you want to break the posts off into it's own thread, feel free.
i'm trying to think of what you can name it but can't decide.
i've seen this called a model 570. a model 7410.
it's a rebadged wharfedale triton. made by roland(pre rotel)
it would be nice to accumulate more info if for nothing but history purposes.
i also read that it was made 1972/73 in a transition time before sears started selling emerson/fisher made receivers. but also read somewhere it was 1969.
i don't know doug. i'll leave it up to you.
