Psidpatch 4-65a amplifier schematic

I devoted the majority of my audio life to singleended dht amplifiers. The eimac 465a is a small radiationcooled transmitting tetrode having a maximum plate. Most of these early tube amplifier schematics are usually 1 to 4 pages of information. With the circuit to be described, the highestspeed hand keying can be. Building your own tubetype hf amplifier, doing it the right way.

Ive built 01a preamps in the past, but this is a very clever circuit. An output beam tetrode with direct heated cathode filament. Now, i used the power of pcbs to build some additional supporting modules to speed up my breadboarding over the ikea boards. Apr 14, 2020 as time is very limited these days, im focused in continuing my modular building approach in lego style. Otl output trasformer less tube amplifiers my consideration on problems of each design. I dont regret the path, however, i do not want a polarised perspective on amplifiers. The 300b is run hot at 33w 376v90ma with a fixed bias of about 78v. The 8165465a is equally useful in audioamplifier or modulator service. View the lists of vacuum tube amp schematics i have available for vintage amplifiers and public address systems below. Over time, i stumble across poor implementations or excessive use of gnfb.

Use of a highc tuned cathode circuit in any grounded grid amplifier is. With the gyrator pcb you can simplify the driver build and also use different valves to experiment with them. It normally takes up to 24 hours to receive the download instructions via email but please allow 1 or 2 business days for the schematic to. Circuit improvements for the heath sb220 amplifier, etc some components by richard l. Minor dc adjustment will be required on the driver circuit via the gyrator load, so can easily implement this new amplifier. Inco diagram of sampling circuits of sampling voltmeter. Local feedback lfb designs well implemented are music to. It was the only one of the 4 we auditioned that actually sounded. I have developed several pcb modules which are flexible to be used in multiple amplifier and preamplifier designs. Browsing my schematic archive i found this early implementation from some years ago on the 300b. Ive been looking for a transmitting tube that could make a decent audio amp, without using outrageously high voltages andor. I originally didnt have a pcb so i built my gyrator in a prototype board. Here is the schematic of the amp i designed or download it in pdf. By matt erickson kk5dr i have read in many articles, the lamentation over the lack of new hams that are building their own gear, and older hams who dont.