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I just checked one of mine, it reads normally (IDENTIFY) on my 7904. Harvey

That looks like a malfunction, since the circuits normally are perfectly able to generate a nice "T". Raymond

Dissipation factor is defined as Rs/X. Since X is 1/(2*pi*f*C), D is proportional to f if Rs is constant. I think Raymond is defining "dispersion" as the first derivative of D with respect to f.

The caps are mostly in parallel with the attenuator output capacitance, together with the FET's input capacitance and of course PCB (layout) properties. Therefore, if you change their value,

The DS1225AB provides full functional capability for VCC greater than 4.75 volts and write protects by 4.5 volts. The DS1225AD provides full functional capabilit y for VCC greater than 4.5 volts and

I see the same thing on my 7904, Nigel.? ? ? Another anomaly is "IDENRIFY" when pressing the Identify button on 7A11 probes.? ? ?Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone

Bonjour, still working on 2465B with many defects, and all options. CTT, GPIB, WR. A5 has had SMD lytics replaced, no corrosion damages, socketed the NVRAM. Looking on the distr, the original

They are from the 576 deflection board Printact relays.

I see the same effect with my 7D15 in my 7904A. It's to do with the character generator in the 7904A. It can only generate a certain (small) number of points per character, and drawing an '8' smoothly

I have a 7D15 mounted in my 7904A and have noticed that the numeral "8" appears to be displayed in a strange way (to my view anyway). Whereas all other numerals are displayed in a nicely rounded

I have several scrapped SG503's so if you would replace the drum instead you can have one for the price of shipping (from Sweden). Contact me off list if you are interested. /H?kan

Thanks for clarifying, Raymond. How important is the exact value of these caps?

Hello George, I bought my set of 3 boards in 2018 at Norway Labs for approx. $145 for my 2756P. You could try to contact Sue Breuner, Norway Labs, Inc. (503) 924-5846 I tried to get a picture in here,

Hi Zen, Thank you for your reply. I could find the white/green wire on the 577. My question was where this point is shown in the schematics. I guess it should be S120A , but I am not familiar with the

I was referring to C18 (Ch1) and C68 (Ch2) at the gates of Q20A and Q70A, through resistors R18 and R68, respectively. These immediately follow the input attenuators, on the vertical input boards.

The original cam material provides low friction against the switch levers. Maybe a small, partial (graft) transplant from another cam switch model is feasible: many Tek modules contain these switches.

Thanks Raymond, I assembled 2x 2.4M resistors from 2.2M and 220K 1W metal film resistors and it’s almost perfect at 0.996875KHz. Yes, I agree, the multiturn pots would be overkill. The purpose of

No, I didn’t.

My mistake again, it is indeed a TO-92. I misread the location diagram. I'd like to register a successful conclusion to this project. Full signal amplitude is back after replacing Q1040. My thanks to

where are you located?