21CT55 #2628 restoration

[DaveWM]

here is a pic of what I was dealing with, its not a drive bar as you could detune and it would go away, and it moved with the horz hold, the BT resolved it.

[Zenith6S321]

Originally Posted by DaveWM

here is a pic of what I was dealing with, its not a drive bar as you could detune and it would go away, and it moved with the horz hold, the BT resolved it.

That's the problem. I will see if I can get one of those. Thanks!

[DaveWM]

they pop up on ebay all the time, prices are all over the place but you should be able to get one for around 40$ if you can wait for a good deal. they use DIP switches to set the RF out channel, and just need a audio and composite video in. I think the correct name is a Blonder Tonge agile modulator, I have the 450 there are others. It can be a bit confusing so look for the correct inputs and RF outputs and the little door that hides the DIP switches in the front.

another benefit is you can adjust the audio and video modulation levels, which is good for getting rid of sync buzz on sets that do not deal with that well.

[Zenith6S321]

Just clicked BIN on EPay to get a BT AM-60-550B for $39.99. Thanks for the tip.

[DaveWM]

if you use is as intended (a direct connection from the modulator to the TV via cable), just make sure you set the RF out the minimum to avoid swamping the tuner. They are designed for cable tv networks and can put out a LOT of RF to drive a lot of cable. I don't want the funny cookie cutters to get mad so will not talk about xmitting ota .

you will need remember to connect the IF in and IF out with a jumper as well.

[kvflyer]

Originally Posted by Zenith6S321

Just clicked BIN on EPay to get a BT AM-60-550B for $39.99. Thanks for the tip.

I have several of them in various models. So, if it doesn't seem to work when you get it, you may have to replace the voltage regulator and/or the filter capacitors in the power supply. Most of the ones I have purchased were OK. But the others were easily fixed with new filter caps and the regulator, easy to do, easy to get. I even got the regulator from Radio Shack of all places.

Cheers!