It could be. Cleaning away this grey (or black) sticky mess, people find left inside these cases is much discussed, I think... here on TekScopes, on the HP forum, and the Web too. Historically,

The foam is I believe polyurethane and I found this product https://www.sherwin-williams.com/homeowners/products/touch-n-foam-professional-polyurethane-foam-cleaner that seems to be specific to the

Liam, intuition points to a failing and dead tantalum cap on on of the LV power bus. The néon on the HV section are trying to start up, but lack power on other circuits causes the flickering. Just

where is the link? I need to change an attenuator. Dennis N4KPI

Choke and carburetor cleaner from an auto supply does a good but messy job of removing the foam and it's residue. It turns it into "buggers" that can be scraped off with a plastic knife or scraper.

Hi all, finally I found time to work on the LVPS repair... I added a picture showing the two types of primary inverter I have in the album : https://groups.io/g/TekScopes/album?id=263466 The top

Sorry about the confusion Federico. I meant this for the values under consideration. 0x2A3 is near the midpoint of the range 0x22B-0x2FC and 3.27 V near the midpoint of 2.716-3.742 . So there is no

Bit the bullet today and scraped all the 'rotting' grey foam insert stuff out of the A6303 probe box. That stuff is really horrible. So what's the best cleaning agent to wipe out the residue? Some

Eric, The P6108 does not have a readout pin ("ID ring"). The other two should, but the shrouds appear to be easily shattered and lost. While the P6120/21/22 are supposedly "miniature modular" probes

I have 3 TEK P6108 Probes that needs id rings and A Tek P6075 that needs a ring and a ground lead. I also Have a Tek 6121 that needs a ground lead and a witches hat. Eric

Hi Albert. I've just been told that it should actually be 1023, not really relevant to the conversion though. Honestly I'm a bit confused, those EXT voltages are not in between the ARES2 limits, are

No, no, no, sorry, the 6AU6 tubes. I fixed the problem. I cheated. I kept going back and forth between the "good" and "Weak" module. The differences were so subtle. I do think I have a few weak

Rescued another 7904 and a few 7000 series plugins. Made sure to grab a 5000 series plugin as well... even if only for the case and a DP501, TM501, 2 - PG506's and a SG504. I still need to test

Where are you seeing CA plug-ins for $10 (much less 99 cents) on eBay? All I see are $39 + $9.99 shipping. Not that I need another CA, but at those prices I might have a need for a parts mule or

Sorry, I accidentally hit enter and the message was sent before I was done. The funny thing is it seems one tube being weak appears to drag the gain of both channels down. Both channel one and

Well, it's down to the 6AU6 tubes. I got them confused now between the good module and the bad module. I can make the bad module the same as the good module by swapping the 6AU6 tubes. I now have

I lately picked up a working 7934, SN B021338 that turned out to have some "UPS mods" to the rear fan housing which necessitated its removal and disassembly to revert the "body work" to stock

The vintageTEK Museum has a number 2- and 3-series plug-ins. I will be at the Museum today and I'll check. -- Bob Haas

Perfect, no problem at all. Slight deviations are all in the game and negligible compared with the range widths. The values shown here are even nicely bear the midpoint of the ranges. Albert

So, Albert, if I'm getting this right, with a py code like this i should get a quick way to convert those hex. hex = '' dec = int(hex, 16) ARES = (dec*5)/1024 print ("ARES =",ARES,"V") If so I