Quote:
Originally Posted by Radio Wrangler
I was saying that there are other limitations than just the Y amplifier. Once you get above 20MHz, the tube does start to be a limitation.
||Good 50 and 100MHz scopes were made without going to the expense of distributed plates, but the short plates needed were insensitive, so the sensitivity was boosted by having an electron lens after the deflectors and before the drift space to the screen. This was in the form of a helical PDA resistor arounf the end of the tube neck into the conical section, and a dome shaped mesh to screen the deflection area from the accelerator field.
Tek sold a distributed plate scope to 1GHz and a storage version as well.
I'd keep the miniscope as it is, as an interesting historic artifact and go looking for a 50 or 100MHz machine from Tek or HP. That's within the comfort and repairable zone for these things.
David
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Thanks for all the replies and advice,Going to look for a better scope and keep the Miniscope as original. Graham.