开云体育

Yep. That's just what I needed. Thanks much! -- John Rehwinkel

I need someone to refresh my memory. The old Tek scopes with the separate power supplies (555 and similar) had an unusual filament voltage regulator that operated with a saturable core reactor.

Hi, there is a 6CZ5 and a 2AS-15 in the regulation loop of the Tek 555 heater supply voltage. The 2AS-15 is probably the one you mean. Quoting from the 555 manual: 'The circuit operates by

Sure enough, each edge connector is a small card with some components. What a story! See above. And, Michael H. sent me the following information: The 7S14 was originally designed as

> > > Do you think maybe a bad output transistor? thanks for your help. > > > Mike > > > > Maybe, Mike. Looking at my 454 manual, I see that the collector > voltage on > > both Q394 and Q494 should

wrote: using the the on imbalance the

Sure. On the other hand, there are dealers selling test equipment who are completely legitimate, but have no idea how to use or test it. Example: Outback Equipment Maybe he lucked out and the

Hi Michael, I'm afraid you are right. There are scammers everywhere. When I see words like "I don't know how to use it", I assume its broken and bid accordingly. I sell a LOT of stuff on eBay, some

mtmpsmp@... wrote:

Is anyone else suspicious of some of the auctions on eBay. In one auction, the seller says he doesn't know how to use it, so therefore can't guarantee it (a 5L14 analyzer), yet has pictures of it

Hi all, :) Not exactly a TekSCOPE, and not catastrophic, but I have a DM501A with a VERY bright LED display. A glance at the cct diagram does not suggest (to me) the possibility of adding a simple

on voltage CRT. unbalance is centered ..................................................................

STunwall@... wrote:

mtmpsmp@... wrote: Boy! I don't understand that either. I have to wonder if the voltage unbalance is actually getting to the deflection plates inside the CRT. Perhaps there is a broken

I have a 454 that has no vertical deflection on ch1 or ch2, using another scope I am able to trace signal from the preamps to the deflection plates. The sweep appears to be in good shape and the

--- Im TekScopes@e..., msfix56@y... schrieb: the which Have you tried to clean the connector pins of the Nuv? Maybe the heater has a bad contact that could make unstable and weak conditions. The

An update. I spent two hours in dismounting the vboard and un removing the pots from it. What a nightmare! If any other people is about to start an adventure like this, please be sure to have a

wrote: now resistors switches. Hi Emanuele, You can safely desolder the two resistors. They are connected to the input FET. Just make sure that your solderingiron ground is on the same potential

Referring to my other post "tek 475 vertical position pots", I am now required to dismount those pots. To do it (the one for channel 2 in particular), I have to remove the vertical amplifiers

I confirm: "the pots are Allen Bradly, and have a double section"; one section seems unused (not connected). I confirm: they are "the ones which you can nicely open with four screws". So your tips