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wrote: Here is something else to try. Swap P2111 and P2112 so that channel 1 and channel 2 are swapped and measure these voltages again.

wrote: 13 is good but 12 is off and being limited by the internal back-to-back diodes on the ouput. Yep. It is being pulled low by constant current sink Q2104 and not being balanced by Q2103 for some

-5% is Good. The Resistors all measure good and are connected. Both the chan 1 and 2 emitter networks measure the same values. 12 5.00 13 5.83 The base of Q2105 is -3.5 - which seems way off What

Hi, I do not have a spectrum analyzer but I am not surprised that a multiplier would have noisy outputs. Jerry Massengale jmassen418a@...

Say this on Craigslist http://seattle.craigslist.org/see/ele/2810475953.html I hope someone buys it to keep it from being torn apart. Bill Higdon here's the ad. " Tektronix 535 vacuum tube

It's a real circus in there. The coarse shaft has a gap, in which the fine shaft drives the readout via a bevel gear and several more gears. The slightest bind or friction will drive a prospective

Those wire wound 0.1% resistors were not cheap and the mechanics of the display are complicated. The DVM should be more accurate. I like the multi-turn potentiometer but just got a pair of the

wrote: Good. These are the IC power pins. They are connected through a couple of diodes to ground and the 8.6 volt supply as shown on schematic 11. If you can dig up the Tek-Made book, the data sheet

Kinda like the mechanical knob/switch version of the 7A13 over the later digital one with DVM. IMO, the switch is nicer to use than the multi turn pot. The switch has a group of 0.1% precision

Hi Tan, One more thing for today. On this 2230 I have, the voltage at the gate of Q935 is 0.211 volts more positive than the Kathode of the SCR, so it must be very close to firing the SCR! The 0.054

3 to gnd 1.38 - Where is this tied? 5 to gnd 6.8 4 Ch 1 or Both 1.68 Ch 2 4.0 14 Both Add 6.16 14 Both Alt/Chop 1.44 14 ch 1 Alt/Chop/add 1.44 14 ch 2 Alt/Chop/add 1.44 DC bias 15 1.8 16 1.04 1 1.16 2

Hi Carl, Option 10: GPIB (my 2465A has that, by the way) Option 11: Power connectors for active powered probes I do not know the meaning of the other options. Patrick Wong AK6C

Congratulations on your *two* scope purchases, Chip! I suggest that you fix the 475 because sooner or later the 2465A will die and you will need a scope to fix it. The main reason to own a scope is to

Congratulations, Jerry! I had a problem with intermittent output at the 10 ns (100 MHz) and 20 ns (50 MHz) positions and the problem was a flaky 10102 chip, U300. So I call that to your attention in

This is part # 150-1206-00 but I can't find out any information about it. The pinout is identical to a generic Hitachi HD44780 type module - Anyone know if Tek used these elsewhere and if it really is

Hi Tan, Thank you for the update on your progress. You have provided us with many things to think about! I wonder where you will go from here with your 2230? The voltage you have at R949 is now about

Confirm, I've purchased several items from them, all of good quality (including two VERY rare TDs for Tek!) Very very recommended. Max

I have to agree that Qservice provides excellent service and order fulfillment and I am very glad that Dinos is supporting the Tek community. Patrick Wong AK6C

Have you checked the control input levels at pin 4 and pin 14 and the power supply pin voltages at pin 3 and pin 5? What about the DC bias levels at all of the input and output pins? They are marked

Think HPOS on lots of things, Volts on PS503A, both POS on 577, VPOS on 1502/3.... -ls- David Wise <david_wise@...> wrote: