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Hi Noel I built a 2m amplifier a couple of years ago using a pair of GI-7b triodes. It has been absolutely trouble free except for one flash over when I accidently grossly over-drove it. That took out

All, I'm writing a program to calculate the numbers on power transformers. I named it Maxwell, as I figured he was the first to come up with the formulas himself. I uploaded the pics to the photo

Noel, Please see this page for lots of links to both retrofits and homebrew amps using the GI-7B including one in progress by Bob,VK3ZL: <http://gi7b.gs35b.com> 73, Tony W4ZT vk4hr wrote:

First post from a new member and already asking questions. Has anyone had any experiences "good or bad" with the Russian GI7B tubes. Just chasing information for a club project a "single band amp" for

Hsu, That formula is for 60 Hz, I forgot to add that. The difference between 50 Hz and 60 Hz transformer size is a factor of 1.2. A 50 Hz transformers core will be 1.2 times larger than a 60 Hz for an

Hsu, There's a short formula one can use to estimate the power by the core area providing they have the wire sized right. You use the core area (a) in square inches. A hint to make it easy to measure

Thanks,Will Could tell me the power rating of TL922 HV transformer? Thanks again! 73! Hsu

Jim, Did you ever try paper tubing for the chimneys? It's the same kraft paper they use in transformer insulation. No hotter than a tube gets with the blower running, it wont hurt anything. This stuff

Jim, Cool idea on the u channel. That will also be a good heat sink for the contacts. gfz pentalab <jim.thomson@...> wrote: Gents I just posted some new pix.[page-3 of my pix page]..... depicts

Gents I just posted some new pix.[page-3 of my pix page]..... depicts how we paralleled the 3 x wafers of the Model 85 switch. We used 1" wide CU strap... x .022" thick... formed into a..."U". Each

MFJ does sell a stand alone dip meter that's decent as I have one of them. MFJ doesn't manufacture this meter either, they have them branded by an asian manufacturer. It's the same dip meter as the

dip least

Hsu, In reality, you can't compute the power output the transformer is capable of that way. Bill Orr done a carry over from the ARRL Handbook, or it was vice versa. The central core area in square

Hi , Could someone can tell me how much output power of TL922's HV transformer? I have an Bill Orr's Radio handbook, there is some curves ,in a chart, transformer weght in pound VS amplifier power

### why doesn't somebody offer an amp in kit form these days ??? That would be the ticket. The end user would have a better idea how to repair it... since he built it in the 1st place ??? ** Hmm,

Sorry, They do say what the form was changed to, I didn't see it the first read. It now is made with a glass-based phenolic tubular core. That would be similar to acting like micarta I would think.