Re: Output power - Part deux
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Chuck:
V-11, V-12, and V-15 should have tube shields?on them.? V-6 and maybe V-7 have tube shield sockets but do not require shields as Steve stated.? Check the picture of the chassis top in the manual. I'm not near my radios either, but have access to the manuals.
73 Peter VE7PS
On Mon, May 22, 2023 at 1:16?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Those shields aren't needed except for one of the 6BZ6's, IIRC.? The reason is that the shield mount has sufficient shielding? without adding a shield.? Check the manual to see which tube needs a shield, as I'm at an airport departure area...
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Monday, May 22nd, 2023 at 11:57 AM, Chuck Rippel - K8HU and ex - NMN < lantareamon@...> wrote:
I have a very late TR4-CW rit and on TUNE, can get around 205 watts out according to an Array Solutions, Power Master II and I can bury the meter in the 200W scale on my W-4. I also have a "C-Line" and the T4X-C puts just over 150W on the antenna. Both were measured on 40M. There is higher indicated power, 210-215W on voice peaks using the TR4-C.
Both rigs have cooling ducted from the bottom of the PA compartment so the pin seals and tube are cooled and the heat is exhausted out the rear of the radio. The finals in the T4X-C are 15+ years old. Both have been re-capped, properly neutralized, and are running on re-built AC-4's.
Interestingly, when I purchased the TR4-CW and removed the top cover, I noticed there were 3 tube sockets that were configured to hold metal tube shields but had no shield installed. I had a number of the black, IERC tube shields from my R390A days put back so installed them in those 3 positions. Besides shielding the tube electrically, the IERC shields have a flexible band of metal internally which comes into contact with the glass bulb of the tube and conducts heat away. Add to that, they are constructed of a black, anodized metal that absorbs radiated heat and keeps it from being reflected back into the internal structure of the tube. I had a product sheet from Collins circa about the time the KWS-1 and 75A-4 were being sold offering similar tube shields as optional accessories. The product sheet featured test results showing significantly improved tube life when the Collins shields replaced the stock, shiny metal shields with which the radios were originally equipped.
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Chuck Rippel, K8HU
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