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- David Berlind5:16am #168839 --Somewhere (it has been a long time since I saw it), there's a video showing the cheap construction of the Chinese variacs [sic], the inaccuracy of the dial and the

Hi Leo I put on the scope without limiter bulb, it took away q9070, cr901and cr903. Fuse also blown away and ac mains tripped. I could not see any obvious short circuit near Q9070. At the beginning,

It puts a smile only face reading all these "made in the US of A" comments :-) versus "Made in PRC" I'm really happy with my Dutch, Philips made, insulated adjustable transformer, which, IMHO also is

A friend once sent me a smallish meter from Aussie land.? When I opened the case there was a humpty great spider in residence. Fortunately, it was dead. My friend was horrified !! I'm not sure if he

Somewhere (it has been a long time since I saw it), there's a video showing the cheap construction of the Chinese variacs [sic], the inaccuracy of the dial and the readouts, and the need to implement

Sorry to push the limit Dennis but I had to add an Aussie perspective ... we don't have a problem with critters in our cars. The snakes will get them:

Hi Leo Put on without limiter bulb. Took away q9070, cr901and cr903.

Hello Saroj, the high pitch sound should indicate it is trying to oscillate and turn on the FET. The one you have should be OK too. The thing is, the inrush current of these switch mode PS is very

Hi Did you go through my previous message? There I described some of the activity and results. I appreciate if you comment on that. Thanks saroj

Hi, I think that should be ok. As far as I can see in the 494 the reference has a bit more room, compared to the 595. But being in the first stage of the power supply, maybe it's not so critical. Un

Reg, You mentioned "a pair of 106s" - Hewlett-Packard frequency standards? Those were very accurate quartz standards and hard to find. I once turned up a couple and they worked but had been heavily

The discussion of strobe lights and Harold Edgerton brought to mind his work on the "Rapatronic" shutter which was used to take photographs of early atomic tests. Here's ab it about the Rapatronic:

Karl, Now THAT is what I call very serious restoration work! Nice going! Steve H. [email protected]> wrote:

Forgot to tell I replaced u930 by tl 494.

Hi Leo I am still searching for the component. I got 4.7 Ohms resistor an 2n5401transistor. Replaced 39 Ohms resistor and 2n2907. For the time being I replaced q9070 by irf 830 which is very close to

I Jon, Why should serious users avoid the "Chinese copies" ?? Why should "used" be preferable to new? Are variacs like bottles of wine? I was a serious competent professional for many decades. After I

Do we really need 20 replies to this? Dennis Tillman W7pF

Hi Jay, LOL Thank you for saying what I was thinking so much better than I did. That brought a big smile to my face. Dennis Tillman W7pF

I restored a Wavetek 1038-NS20 to fully working condition. It is using these modules: 1038-NS20, D14, NS206, and one labled "calibrator output" and "ext ref input". When I bought it on eBay, I found

WTF! Discussions drift because people make statements others don't understand and the explanations often go far afield. It is inevitable. I was not aware that discussion on TekScopes was restricted to