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Albert, I can only think I'm not interpreting what I'm seeing on the 'scope screen correctly. I'm probing TP286 (output of TTH) with Sweep Range set to 50nS, 5nS/div in sequential mode. I have the

Hi, Update. Got them from Q Service Electronics, though they only had 3. Still need one more (if anyone has one). Thanks, Chris

Hello all, I have a Tek 7704A with no readout. Does any one have a readout board (No. 34) on lower left rear or scope? Is there a source I could contact for the board? Thanks much -- this group looks

Hi Patrick I'm very interested ,if live in Argentine is an options. Regards Pastor Mayor.

David, Is the display also distorted in store mode? If so, it might be a loose connection to one of the horizontal deflection pins of the CRT. --John Gord

Hi, My AFG5101 has started saying "battery low" when powered on - is that an easy thing to change? Also, the LCD contrast is very poor, as is the viewing angle - is there anything I can do about that?

This is a great story. I just repaired a 465 with a power supply problem and it was just an open filter cap that was bad. I remember looking at the high frequency output from the oscillator but never

Hello and a warm welcome to the group, just to amend to Arden's excellent recommendation. We all came across this before - one shall start with some basic checks of the power supply first. It seems

Hi, On a tek 2230 in non-store mode, the displayed signal becomes compressed when position is moved to the left. So if I have a 5K square wave displayed at .1 Ms the first 1/2 of the wave will be 60%

Hi David, Our start and stop terminology is confusing since both are stop levels of the THT. The "start" is the stop level corresponding to the left most dot at the trace (start of the trace), the

It's not hum - the mainframe supplies regulated +75 DC for plugin heaters. It's Coarse Balance. The beautifully simple circuit Tek used is only possible with 8393's. Dave Wise

Well - not quite fully clockwise, but almost. Now to the chase - I gave up on the calibration instructions on page 5-33 of the 7T11A manual, and went back to the original instructions in the the 7T11

Or was it the predecessor 8008? I went to work for a company in '75 and everything there was TTL. No microprocessors except one of the engineers was clacking away on a teletype terminal that was

Hi Tan, This morning I remembered about an interesting 2235 repair that was done by a very crafty person by the name of Irwin Zosa during 2007 and 2008. Irwin lives in your part of the world in the

Greetings to the group. I found a copy a later W manual with the FET mod. If there is a need I will scan and post it online. Its listed in the change section and is 13 pages (schematic and pictures).

The unit has been sold. -- mailto:oz@... Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)

I have recently?acquired?a TAS485 and I was wondering if anyone knows what are the usual quirks or known issues with this series of scopes. Is there a blue shield for this series of scopes, because

Tom, in 82 we redesigned/copied the SWTPC Computer on EURO-cards (100x160mm) and sold it here in germany. Last year, by chance i found one of our constructed/manufactured computers in a dumster ;-)

I also think he is right about the 8080. I do remember the 4004 and for a short time the 8008 chip sets. We were looking at them to use in an IFF transponder. In '84, I bought an 8080 chip for $200.

Resent due to a mailer error. * BEGIN FORWARDED MESSAGE * Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- http://www.bluefeathertech.com kyrrin (at)