The generated heat is a function of plate dissipation, not of the plate material. Certainly it takes longer for a thick anode structure to cool down. 73 Peter IMHO the graphite anode version puts out
A nice side effect is that gain and power output increases, it is not the reason for improved stability. That is improved because the frequency dependent components are omitted and the connections fr
You should have reduced the L across the resistors! 73 Peter I'm converting a SB200 for 6M. What's the best configuration for the Anti-Parasitic Choke? Thanks - Paul in parallel, OR use a small 7-10-
The pin 1 problem generally is not a problem with the gear but with the external wiring 73 Peter balanced inputs are used, I have yet to see any gear with a pin 1 problem. It has to be really old gea
There is not much ham gear on the market with a pin 1. And in consumer audio equipment it is rather RCA then XLR. 73 Peter Actually, it is a problem built into equipment by a designer/manufacturer wh
I learned about the pin1 problem many many years ago when XLR started to show up on WDR+Deutsche Welle equipment, with the DIN connectors before it was a pin2 problem. I do not agree to call everythi
Is the ALC voltage not derived by a capacitive divider and diode from the drive voltage at the cathodes? The +120V for cut off bias coming from the bleeders are switched away by the PTT relay. 73 Pet
The BEKO HLV-2000 amps are specified on 2m with 1850W at 1db compression with a pair of them. THE HLV-1000 is specified at 1020W. So indeed one device is not enough for a wide band HF amplifier follo
With the neutral lost on a direct fed power supply nothing will happen as long the neutral connection of the p/s is connected to ground locally. At least not in Germany where is not possible to get 1
Jim, you will not find any house in Germany being fed from a center-tapped transformer. 3 phases + neutral is standard, very few houses are still single phase + neutral. The distribution transformers
Yes, transformer less power supplies are great. I used them extensively with my big sweep tube amps in the seventies. Those were using all three phases and both polarities with one way rectification,
Is that a 160m mono band amp with a loaded Q of 12 in the tank circuit or is your 160m toroid coil just delivering one halve or less of the total inductance on 160m? 73 Peter ORIGINAL MESSAGE: (may b
I donīt believe that the anode voltage drops to zero volts at 625mA anode current. 4KV voltage swing in your calculation is probably too high. 73 Peter Just to clarify, I used 1.6 for "K", which in I
Who talked about a YC-156? There are tubes with less capacitance around. The coil value depends on the tube capacitance. 73 Peter circuit is commonly called a L-PI. Typ coil values are .3 to .7 uh. A
Efficiency goes up with higher anode voltage. With a 2m push-pull and 4KV on the anodes we obtain 60% easily (5 out)at the DK3EE EME station. 73 Peter Bill, Thanks for the update. I think the GS35b i
That probably is just a phase detector to check for correct anode tuning state between cathode and anode (in phase) or grid and anode (180°). 73 Peter A similar linearity-detecting scheme was used in
What is the reason to have the screen unconnected from its voltage or switched? 73 Peter The bleed resistor is not part of the power supply. It is installed close to the tube itself, connected direct
OK, understood, but I never saw that in commercial tetrode amplifiers. The anode to screen voltage will be lower with screen voltage supplied. I always bias to cut off with grid bias and protect grid
What is the loaded Q of your Pi circuit? Is that sharp tuning with the load capacitor on all bands? When tuning the anode capacitor, peak screen current with it and use load for the correct screen cu
Sometimes intelligent people avoid flea markets, not to be mixed up with the crowd. 73 Peter Been there done that and is why I bought a 3000 W CCS RCA load, built by Bird, with a tapered snout and ra