开云体育

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)

These dates sound correct: I remember reading the introductory data sheet for the 4004 in 1971 or 1972. It made no sense at all. I couldn't figure out what it was. I was used to logic gates and this

Hello All: I currently have a Tektronix 300Hz filter for the 27XX series Spectrum Analyzer's for sale. If interested please contact me off the reflector. 73 Rich, AJ3G

David, More for you below. Hope it helps: I think you measured the "high" side of R860(the 130V supply line). Maybe I should have said measure the collector of Q860; this is the same as the base of

Hi Francis, You are spot on. There is no stupid question. After I downloaded the 2230 (as directed by Tom) and compared with the 2220/2230. Immediately, I notice the difference. The 2220/2230 has a

Hello, Tom and the group-- IIRC, the 8080 was introduced in 1974; the 4004 was introduced in 1971. In the early 1960s, I worked as a co-op student at a company that manufactured magnetic-core logic

I worked at Bendix Communications Division from '66 to '71. Even had my own 545 Tek scope. They were the days. DTL had just arrived and a lot of military systems were just being converted to the pure