I wasn't asked, but I would vote on the four GU48/833A, (triode) with push-pull paralleled pairs. A muffin fan is all that you need to get the heat out of the box. -- 73 Ron KA4INM - All E-mail sent
This idea is along the lines of what has been used in many high power broadcast amplifiers for over 50 years. (guillotine style) Except they use/d a solenoid to wind up a spring that hit a micro-swit
You can always use DC on an indirectly heated cathode, but with a directly heated filament you must consider the fact that one end of the "cathode" will have 12.6 Volts more or less cathode to grid b
Actually, with everything being the same the lowest loss is from the highest impedance possible for the form factor, the highest power handling capacity is from the lowest impedance. 75 Ohms coax has
I think filament chokes are used with cathode driven amplifiers only. I have never heard of using them with grid driven amplifiers. The only alternate that I have ever heard of is threading one condu
Because of the high oil content. The foil can easily be removed, (with a finger nail) I always do for every jar that I open. -- 73 Ron KA4INM - All E-mail sent to this address shall linger in the Goo
When I was in school (electronics school) we had a wise guy that tore apart "5 tube all American's" for the dual 150 Volt electrolytics with three leads molded in, (at home) he would go into an unuse
Electrolytic capacitors and light bulbs are the only items in a HAM amplifier (or almost anything else) that have a pre-determined life expectancy. It doesn't mater if 99% of ham amplifiers use brute
All of this talk of converting them to another tube makes me wonder if this isn't a good candidate for a water cooled tube. They can operate very quietly also. -- 73 Ron KA4INM - All E-mail sent to t
There is a difference between the "maximum" and the "working" Voltage rating of a capacitor. -- 73 Ron KA4INM - All E-mail sent to this address shall linger in the Google cloud forever! _____________
I was taught (at a TV station) how to put PL-259's on with a single edged razor blade, that and a big soldering gun. (I still do) We did hundreds a day each, usually in a party of 4 or 5. -- 73 Ron K
/*snip*/ We also need to take into account the fact that many HAM receivers do not reproduce 120 Hz well. When we started the earphones were connected between the plate of the AF amplifier and the 90
Danny NG9R Pease: EG&G tower lights (strobes) have 1,000 Volt ferroresonant power supplies, self regulation is a FAA requirement. -- 73 Ron KA4INM - All E-mail sent to this address shall linger in th
/*snip*/ We also need to take into account the fact that many HAM receivers do not reproduce 120 Hz well. When we started the earphones were connected between the plate of the AF amplifier and the 90
Most commercial broadcast transmitters monitor the current through tube filaments and possibly the Voltage. The current is much better because it can't be wrong at the tube like the Voltage can. As c
I have never worked with MDF, but I think it is a wood product (or a plastic product) and an old rule for power amp construction is: never use a combustible material anywhere near the action. I have
That is because the 465 (I have one) was USABLE to 100 MHz, but FLAT to 60 MHz. So not being flat to 100 is no surprise. They were sold concurrently. I also have a 475A which is flat to 350 MHz, whic
All scopes of all brands with sufficient bandwidth (HF response) will work, but almost everything other than HP, Tek, R&S exhibit excessive vertical amplifier DC drift (the trace moves up and down as
All nylon has rather poor weather resistance, even the UV resistant flavors. Use "delrin" if at all possible instead. -- 73 Ron KA4INM - All E-mail sent to this address shall linger in the Google clo
Yes, and you can have two diodes one in each direction for twice the Voltage for insulation testing. -- Ron - KA4INM _______________________________________________ Amps mailing list Amps@contesting.