开云体育

Jerry, I found a 82pF, N080 capacitor in my parts "inventory", it seems to be NOS, but it test at 92pF. See attached. If ever you may need it, just send me your mail address, in case that

I have found that 82pf N80 difficult to find also. I have successfully used an 82pf N30 as a replacement. I have a couple left. If you have no luck finding an N80 shoot me an email at cateswa at msn

It looks like the problem was one of those big offenders you mentioned Walt. Specifically C85 82pfN80. It measures 82pf but seems to have lost it's temperature compensation characteristics. Now the

we are in the wrong group but i own an A300 that uses 7408/6v6 output. simple amp w/a great sound w/only 12 watts out. barry ________________________________ Sent: Sunday, December 1,

Thanks you Walt. I appreciate all your help. I will try to implement your suggestions tomorrow.

Well, that's the reactance of an inductor. Someone measured the inductance with a bridge. That measurement may or may not change with the level of the drive from the bridge. In any case what I

Richard, The old formula I learned is X= 2πfL. for 60 cycles--- 6.28 *60* 12 = 4521.6 [a lot of X-ohms ] compared to 85 R-ohms, but that must be the magnetizing inductance at some low

This is still an odd transformer. There have been systems of color code for transformer leads for many decades. In some cases manufacturers had their own codes, usually shown in their catalogs. In

Walt and Jim and All Black wires in and red wires out remind me of typical B+ power transformers. B+ for transistors were low voltage back then, so maybe you have a low voltage B+ rectifier

Jerry, I looked up some of my old repair tickets from the 90's. I found some other things you may try. Chassis corrosion and grounding were problems on several tickets. Remove the mounting screws of

WaltYou can always apply 12VAC to the black leads and measure what what is on the red leads.? Still feel that it is an AC step down power transformer. You should put your call on that document.?

Jim, That list you attached came from my website. That is what is so confusing about this hunk of iron. Those colors don't match any standard. ?? Walt Cates,

All thing are possible since transformers are bilateral.? Typically, audio transformers do not use two black leads or two red leads for that matter and the laminations are usually thinner then those

The big offenders in the 46 VFO are C84 10pf N750, C85 82pf N80, C86 100pf NPO, C87 47pf NPO and C89 82pf NPO. These 5 capacitors are all 20 years past their useful life. I would replace all 5. You

The VFO in my newest HT46 has excessive drift. In standby mode it will drift about 1KHz in the first 15 minutes and then go another 600Hz in the following hour. The VFO drifts downward in frequency so

Flip the drawing and you could have a push pull amp driving another stage. Walt Cates, WD0GOF https://wd0gof.com/Hallicrafters A majority of acceptance is not proof of

Thanks Jim, I must be visually wonky. That is bad. I know I should write the numbers down and compare apples with apples, but… a real goof here. Yes it must be a real step-down. 150 VA seems

DonWith a primary resistance of 85 ohms @ 12 Henrys and a secondary resistance of 0.6 ohms @ 0.055 Henrys how could this possibly be a step-up power transformer?? At 7 pounds, I would guess it would

I am not really interested in further characteristics of the transformer or building anything with it. I would like to know what radio it was used in so I can make it available to someone who needs

Yes Walt I consider the turns ratio to be a primary characteristic of any transformer, but voltage ratio is usually much the same.. assuming I was guessing that you just measured it and have it