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If the tube tester was designed for a lower voltage i.e. 110v to 115v and your voltage is 125V, when not install a bucking transformer? A 12v may work, but will depend on current and the I^2R losses

Hi, I was also going to mention that you might be better served by a UPS. The right type would include Surge Suppression capability, and performs a direct conversion of AC to DC to AC. This includes

Eric, I'm not to fond of using a Sola transformer for various loads on my test bench, as I understand the output waveform? distorts significantly with different loads. I prefer to use a? a manual

I was expecting some exotic electromagnetic hardware I'd never heard of before when I read 'Irwin clamp'. Didn't expect one of those :)

Hello, Here is the link to the current probe that I built to be used from 50 KHz to 50 MHz: http://ve2azx.net/technical/RF_CurrentProbe_1VperAmp.pdf I also have an external Current? Probe for the MFJ

Those pole or pad mounted Cable TV power transformers are CVTs. They output either 30 or 60VAC that is injected into the large hard coaxial trunkline, usually in the center of a section to minimize

HI, Yup, the Impedance of those old SOLA Power Conditioners could cause a lot of dissipation and they made good foot warmers during the winter. To put it a little into perspective, the MIL-STD-461

Interesting how they operate, gapped transformer, one side saturates, etc. https://www.circuitstoday.com/cvt-constant-voltage-transformer The site also has a waveform showing the clipped waveform, and

The capacitor vale is critical, to make the transformer resonate on frequency. The high power factor is due to losses incurred in this type of regulation. If the capacitor has no leakage, leave it

I have a new to me Sola constant voltage transformer. I am curious as this is a VERY vintage model it has an output at 115 Vac. I am hoping to use this to soften the power line in for some of my tube

Very nice work, Ed. Looking forward to future installments of "Ed's transformer adventures"! --Cheers Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 420 Via Palou Mall Stanford University Stanford, CA

The two-stage transformer works beautifully up to just over 100 MHz. The low frequency cutoff is around 5 kHz at 2.5 R driving source. I also tried direct drive from 50 R, with a 50 R load in

I put up two photos of the two-stage construction. "Parts" is the parts. The winding is a ribbon type, five turns, which is just right to wrap nicely on the core with very good fill. Note that the

The following photos have been uploaded to the Ed's Q meter transformer ( /g/Test-Equipment-Design-Construction/album?id=283881 ) album of the

Preliminary experiments so far indicate the two-stage unit should be able to do 100 kHz to 500 MHz, or 5 kHz to well over 200 MHz, depending on the hookup of the bifilar primary. It's not flat - I'm

I found in the magnetic parts dept a few more cores of the right mechanical size, with around 60-80 nH A sub L range. This gives some more options. I'm also looking at a two-stage type setup, going

I have done some experiments on the transformer, with the initial design, and several different winding arrangements. I didn't have any suitable copper foil in stock, but found some fine expanded-mesh

Thanks Ed, Your thinking echoes mine exactly. I agree that iron dust is not the way to go so will try to find a bigger ferrite core and maybe that will help extend the frequency range. The one I tried

Glad you made it through it. Yup, that is a stressing event. I found out that I would plateau into a sort of “Stasis” just before I thought I was going to collapse. My system just kind of

Yup, Henry Ott’s book is the best. Talked with him about it and his career. Attended one of his seminars many, many moons ago. Kept his presentation slides for decades. He was a great, soft-spoken