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I forgot about Hsu being overseas. He would have a 50 Hz transformer and the formula I showed was for 60 Hz at 12 kilogauss. The one for 50 Hz is; TPV = 5.82 / a a = 0.206 x sq rt of P P = ( a / 0.206

Will, untrue all you need to do is make the core bigger to reduce the flux at 50 Hz. Volts per turn stay the same. Wire will be a bit longer due to bigger window. So bigger core makes more resistance

That is exactly why 400 Hz. is used in aircraft. but then some nut decided to do 270 VDC and kill people working on them. All to save the constant speed generator shaft interface. A 50 Hz. transformer

We hav

wrote: reduce heating but this will reduce the output voltage due to turns ratio change, gfz ### agreed. So, in essence... to properly run a xfmr on 50 hz.... you require MORE turns on the pri... and

Lower frequency you need more primary turns so a higher tap to reduce heating but this will reduce the output voltage due to turns ratio change, gfz pentalab <jim.thomson@...> wrote: --- In

Good Morning Noel & All: I have started construction on a pair of GI-7b's for 6 meters, but 6 mtrs cooled and 160 Mtrs got ready to come on for the winter. You can see my progress, or lack thereof on

#### HSU.... as far as I know.... from memeory... the plate xfmr in a TL-922 is rated at aprx 1.2 KVA CCS. The RL Drake plate xfmr, used in the L4/L4-B/ L-7 is also rated at 1.2 KVA CCS. #### In the

wrote: wounds. ######## I"M MOT USING WIRE WOUNDS !!! ### Not reliable enough for me. Just one MOF reistor out of a string of 24-30 has to open up... and it's gonna leave one expensive mess to clean

peddler saying that Delrin would for sure work in this application. I'll have to look up the difference in the D factor between Delrin and say Teflon, etc. I have the Modern Plastics Encyclopedia

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