Is any rule of thumb to estimate input impedance for a tube/s in GG configuration?. Best regards Guillermo - LU8EYW. _______________________________________________ Amps mailing list Amps@contesting.
Bill Coleman N2BC escribió: This could be done connecting the plate tune cap one or two turns (trial and error) ahead in the 10 Mtrs. section of the Pi inductor also. Best regards Guillermo -
I want to second a previous post which asked about loading. Is your amp fully loaded?, because Ig is somewhat high and plate current has what I guess is a one tube value at full output. Best regards
I'm searching for a schematic for the subject's linear amp. It's from Trans World Electronics, a 500 Watts ¿out? solid state amp. Thanks for any advice . Best regards Guillermo - LU8EYW. _____
Many thanks for all the answers; I've noted also the error in the drawing. This is not the same model, mine's has five selectable HF (2..30 MHz) segments, or either an "auto" position for auto band s
R.Measures escribió: Swinging choke has the air gap. Best regards Guillermo - LU8EYW. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest
Please see below: Kenneth D. Grimm, K4XL escribió: Me, the first; that sectioned inductors, although not inductive related decoupled, are not wound in separate sections so as to reduce distrib
Which is the main purpose to design an RF class A stage at high power levels?, if with AB1 one can accomplish the required (and even more) the unwanted signals attenuation with better efficiency. Any
Hello Peter, well, I was pointing at many mentioned designs, which had 8122, 4cx350's, etc., working class A (and I agree I'm stating those as "high power", although maybe for the rest of this nice l
Members of the list, have all of you a good and prosperous 2006. Thanks for all the help. Best regards Guillermo - LU8EYW. _______________________________________________ Amps mailing list Amps@conte
This could be another way to achieve continuos tuning input: http://www.wb8erj.com/813mainsch.htm Best regards Guillermo - LU8EYW. Bob Kirkland escribió: ______________________________________
Sorry if this is a silly question, but, which is the criteria for sizing (mainly its diameter) glass tubes envelope?. One can see a glass envelope in an 813 tube relatively near the plate electrode,
k7fm escribió: Does it still has nothing?. So it must be equal regardless inside volume. Best regards Guillermo - LU8EYW. _______________________________________________ Amps mailing list Amps
Ian White GM3SEK escribió: Well, I ignored that and simplified things also; then, after "vacuum process", and to "kill" those over a million molecules tube's manufacturer use the getter method
I've heard many people who stated that it is only "to make smoke":) so you could realize what happened. Either the plate choke or the line fuse that fails open is better than nothing, so what wire di
Jim Kearman escribió: Is there any procedure to test them, if no datasheet is available?. Best regards Guillermo - LU8EYW. _______________________________________________ Amps mailing list Amp
That happened to a friend's 813 linear amplifier!. There was a barely notable "Tic...Tic..." every a few seconds. Because we had no choke at hand, it was temporarily solved with a 68 K 2W resistor in
Few years ago I built a small dummy load (5W) for a friend, who wanted to use it at VHF (2M). With the resistors available, I had to add an inductor in parallel with the three 150 ohms, 2W resistors.
I'm searching for the data sheet of old 701A tube. Or typical ratings and maximum frequency of use. Thanks in advance Best regards Guillermo - LU8EYW. _______________________________________________
A question comes to my mind after looking K values and working class: K value increase as the conduction angle decrease, so am I wrong in stating that AB class (either AB1 or AB2) conduction angle is