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wrote: glitch resistors and magnetic breakers in the primaries of the transformers is all I need ### You gotta be kidding us right ?? 2 uf or NONE !! ### here in NA... although 3 phase power [typ 12.5

wrote: ### I looked at the 8k/3 k ultra manual I have [same manual does both amps]. On the 8k they use 5 x 20k-100w resistors. Diss is a whopping 300 W CCS..... presumably so the resonant choke filter

Copper tubing is quite expensive overhere now. 10mm diameter is 3,60 Euro/m, 18mm is 6,40 Euro/m. Prices are for small quantities of course. 73 Peter ________________________________ From:

Zzzz Denny == Have you checked the max V rating of Ohmite's 100W resistors? R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org

Instantly is pretty soon.

What is your reason for that large capacitor? Are you using single phase at that power level? I only use 2?F maximum or none in my large power supplies, so my glitch resistors and magnetic breakers

--- In ham_amplifiers@..., R L Measures <r@...> wrote: RICH SEZ...Correct. Jim. My thinking on NOT using a fuse holder is that if the fusing element blows, the reason is not a defective

I check in here every few days to count on my mental fingers how many times Rich rants on about Tom... Then I go to the other shrine and count how many times Tom mentions Rich... It's umpteen to zero

the grid current will skyrocket..... hence another reason for a fast grid fuse. seems to me, both the plate current and grid current went beserko. instantly... > RICH SEZ ..quite soon is more like it

indeed quite soon is more like it

45 ohms is 36% high. If the outside of the resistor is not burned, the resistor may have been damaged by an intermittent condition,

amplifiers. Q of >5 at > 100MHz. IMO, it's better to keep suppressor Q under 2. ### The 8 k is rock stable... with a 1 turn strap of 1" wide chrome plated material... which is doing nothing..... toss

wrote: ever drive the amp hard enough to roast the grid ### partially agreed. IF u have a HV fuse... and it opens... the grid current will skyrocket..... hence another reason for a fast grid fuse.

bad! ### IF the tube fil shorted to the grid... u may well be correct. The CT of the fil xfmr would be tied to the chassis... via the neg terminal of the grid meter [through the grid fuse... then to

wrote: I understand that this is a pretty good tube since it doesn't require any special socket. If I didn't have so many irons in the fire, I'd snag this. But hell, I don't use my amp enough as it

This wouldnt be the core problem I guess but if a 33 ohm resistor has changed to 45 ohms it needs to be replaced, I hope you have done it already. To me it sounds like the problem is on the output

I forgot to add that I have just replaced the two blocking caps on the SB-200, and added a third doorknob cap on the 80M switch position in place of the big mica cap. I have not yet fired it up with

Check your plate blocking cap and pi - network components. Also TR RELAY contacts. Sounds like you have plenty or drive but output circuit may beon th ewrong frequency. Plate and load settings changes

Hi all - I have what used to be a working SB-200 amp. It is not working well at all now. I really want to get it on the air for the CA QSO Party next weekend. I come to you as a last resort. I used to

I see that there's one of these on that e-auction place for ~$57. I understand that this is a pretty good tube since it doesn't require any special socket. If I didn't have so many irons in the fire,