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U9005 and U9006 are MC14510 are up/down counters.? They either count pulses generated by the band up / down buttons, or get loaded by the digital control board.? ?The inputs I was concerned about

I just picked up a B-line that had been in storage for 30 years.? As soon as UPS drove off I started opening boxes to see what I had.? So far I have plugged in the receiver and it actually works

I have the Drake R-4B and the T-4XC. ?Both PTOs ?settle down very quickly. ?The next time, I turn on the R4-4, I will measure the drift with my counter. -- 73, Bernie. VE3FWF

I was actually thinking more of temperature stability with a precision regulator. 73 -Jim NU0C "wb6ogd" <garywinblad@...> wrote:

Hi Gary Two shiny new 7805's arrived? yesterday? these are 1.5 amp versions, will check them out later today. Regards Mike G3ZCC

I have and I think I actually tried it.. supplying just less than the zener voltage.?? Didn't help IIRC, Voltage stability is actually good, its temp stability that can use work, 73, Gary WB6OGD

Doug reports a 1966 vintage and Peter shows that to be the early bipoler PTO. Exactly consistent with my early (13 tube) R-4A which also drifts... almost exactly 1KHz! My later R-4B with the FET PTO

I've often wondered if there could be any benefit to a precision regulator IC in place of the Zener. Has anyone else pondered this? 73 -Jim NU0C "VE7PS" <ve7ps@...> wrote:

Doug: You didn't state the serial number but that manufacture date puts the serial number at close to the 23,900-24,000 range. That likely means you have a PTO based on the #19,500 schematic which is

That's a lot of good information from Peter, Harold, and Gary. Peter, the TR-4 was placed in service Aug 19, 1966 according to notes in the manual by the original owner. Assume the manufacture date to

HV properties of various coaxial cable. RG-59 has a smaller center conductor, and is rated at 2300 VRMS. RG-6 has a larger center conductor, and is rated at 2700 VRMS. RG-59 is 22 AWG, RG-6 is 18 AWG.

You know the wire Drake originally used has lasted since 1978 in My L7. Just a note. Tim WB8UHZ

The following photos have been uploaded to the VE7CA Drake photo ( /g/DRAKE-RADIO/album?id=261749 ) album of the [email protected] group. * Bottom view.jpeg (

You can get Belden 15KV Test Lead wire in Red or Black. Been using it for years now. 73, Dick, W1KSZ ________________________________ Sent: Wednesday, March 10, 2021 12:18 PM To: [email protected]

Teflon coated ignition wire as used on cooker or oven ignition systems 73 Jack 2M0GQS ________________________________ Sent: 10 March 2021 19:13 To: [email protected] <[email protected]>

Just buy wire that’s rated 10k -15k . I have had wire from RF parts that failed! It was military surplus and I don’t think it was labeled correctly. 73s Byron AC9PA

I can see that Drake really improved the PTO in successive models.? I have an R-4A that drifts about a full KHZ from very cold to total warmup.? My B line is much better.? My T-4xB actually has the

Thank you for your comments Richard. Below the finals in the bottom there is a shield between the finals tubes and the rest of the components. Along this shield there are 5 feed through insulators in

Perhaps.... My thinking is that in all the Drakes the PTO's are in the front of the radios with most (ok, not all, depending on the rig) tubes located off to the side or back of the PTO.? In the