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(Un)fortunately enough, the frequency control section is one area that I've seldom/never had to work on, myself. Since you (Federico) have extender boards, I think I'd try applying a combination of

Probably 0.4inch. "Common Design Parts Catalog MECHANICAL Catalog 2" helps a lot. Even the dimensions of the knob flutes are accurately described.

While it may not matter for this application, the inductance of film resistors may be different depending on type, value and trimming method both from one resistor to another as well as to carbon

Carbon composition resistors have their place where where short duration, high energy pulses are involved. Film resistors just open up. Carbon composition resistors increase in value with age,

FWIW Allen-Bradley carbon composition resistors are identical with Ohmite.? For some reason AB marketed through Ohmite. Same with AB and Ohmite pots.They are about the best of the carbon comp

I have repaired a 494 as well as a 2756. Apart from what KE5FX writes in his document there are a few other things to look out for. On several PCB's there are High Ohm carbon mass resistors made by

Thank you! larry

This subject has been discussed many times over the years. A short answer is that the technical aspects of the CRT are quite modest in terms of speed (and therefore operating voltages), and the only

Hi Federico If you search the forum messages for 'John Miles' you may find some relevant information. Ciao Federico, se cerchi "John Miles" nei messaggi di questo forum, magari trovi qualche

Hi all, I'm new to this group, I'm italian, apologies for language errors ;-) I have a Tek 494P (fantastic!), but as you well know it is a “time bomb”. I have repaired it many times, but now I am

I didn't want to mention any particular vendor/manufacturer. Nothing? ... at least nothing inexpensive... beats the tunnel diode pulse generator, for low level, very fast, very sharp pulses. Tekwiki

If you can get the model, you can get it 3-D printed, very cheaply... maybe even free shipping. Unless you find someone locally, with a parts mule... getting the 3-print might be cheaper than shipping

From your picture I note that we have different knob styles. I only read 366-1124-00 in the manuals 070-0905-00/01 but "Tek_RPR_366-_Knobs_and_Pushbuttons" lists both 366-1007-00/01 and 366-1124-00

Can confirm 10.16 mm (=0.4 inch) on mine /H?kan

Another option is to increase the CRT filament voltage. The easy way is to set the mains voltage selector to LOW. Since the CRT filament is powered directly from the main power supply transformer,

at 6.8mm, I think it is too low. https://i.imgur.com/N5YSwEU.png left is the expected 10.16 mm.

I measured about 6.8 mm, more precise is difficult (for me). Albert

Hi Max, That was my first thought as well, having a 7A26 last year that was cursed with half a dozen bad ceramic trimmers, and last month a 492P with a bad one in the VR module. I replaced C187 with

Thanks for saving the inventory from getting tossed. I'm sure it will help keep a lot of Tek and HP gear from getting parted out or worse. The benches in my shop are 75% Tek, so I'm grateful for your

I Adam, I strongly suspect that you have a bad trimming capacitor (C163 or C187). They had influence on both + and - signal path. If there is no change at all when turning they, one strong possibility