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I've been collecting tube radios for some time. I'm getting ready to be able to do alignment and repair. I understand that an Oscilloscope is not really necessary for this work but I think it would be interesting to insert a RF signal into a stage and see the output with a scope. Any thoughts as to which type and model to use? What bandwidth at a minimum should the scope be? At leas two channels? Cost is also a factor. Thanks for the help.
Tom in La Porte, Indiana
Home of the First Automatic Telephone Exchange.
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thanks
I almost NEVER use a scope when I'm aligning tuners..If you want to look at 455khz IF or a 19khz pilot signal on a scope,a 1 mhz would work however,the scope I've been telling people to buy for years is the Sencore SC61..Its dual trace, 100mhz, and it has a built in freq counter..It is also easy as pie to fix and it cost less than 100 dollars these days.
What you really really need for alignment is a good DVM,a stable signal generator,and if you want to do FM stereo you need an FM stereo generator..
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Just purchased a nice one for $140 including shipping. It's tested and comes with a pair of probes.
I have a modern digital scope but at this price, I couldn't resist.
What signal generator(s) do you recommend. I have 3 scopes a good DVM (and to analog, one of which is tube), but no signal generators! I have a lot of very high quality tuners. Like cassette decks, hey give theme away now and I can't resist.
I stopped buying cassette decks when I bought a Nakamichi RX-7 for $35. I don't think I will be able to do much better, although I have shelf space for a Dragon if I happen to stumble upon one ...
Dave
You are of course correct. As was mentioned in my original post I knew a scope wasn't needed or necessary for working on tube radios. Maybe I just need an excuse to buy one.
Tom in La Porte, Indiana
Home of the First Automatic Telephone Exchange.
Here is what you want and the only thing I've seen go wrong on these is cleaning the module pins..Pull out the module and spray the pins with any electronic cleaner such as Deoxit and you are good to go..This guy has 125obo on it but I get he'd take 75usd as he has no clue how to operate it..
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
As usual, the Sencore probes are missing, so you can't use the voltmeter with the same probe... You could use a separate probe, no better than using a separate DVM. A good set of Sencore probes will be more than the scope.
I did not realize you could pick up this much scope for so little. Itbecomes a no brainer:)ignore my stupid statement below and, 2) grab one of these. When I last tracked these somewhat seriously you had to pay 4 figures for this much in one box. It is like 3 cartons of cigarettes.
Don Brian Levy, J.D.
Toronto ON Canada
Brian
They weren't stupid and the old cheap scope would work fine for all practical purpose but since these are so cheap,it is better to go modern.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
To start with, I would suggest just finding something local and cheap. Use it and find out if an aid or more a toy. If you are collecting old am tube radios a lower bandwidth single channel scope is sufficient. While today it would be nice to have a dual trace wide band ss scope back when I was on the bench an EICO tube scope working up to snuff was a great friend.
Don Brian Levy, J.D.
Toronto ON Canada
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