viren bakhshi
Well-Known Member
Lyrita Audio introduces the new GM70 SET Mono power amplifiers, and the DHT Line preamplifier:
GM70 SET Mono Amp - single ended power amplifier with a power output of 35 watts, using the Russian GM70 directly heated triode. Two stage design, with a triode connected 6E5P driver tube, coupled through an interstage transformer to the GM70 output tube. Separate transformers for high voltage, for filament current, for bias voltage.
DHT Line Preamplifier - line level preamplifier using the Russian directly heated 4P1L tube, connected as triode. Very simple signal path, capacitor coupled output. No feedback. 6 dB gain. Output impedance 1250 ohms.
The mono amps were developed, again on request from a customer, for more power from a single ended tube design. The Russian GM70 transmission tube, similar in rating to the 845 transmission tube, turned out to be a great contender. Easily available, very sturdy construction, inexpensive. Using the stereo chassis for the mono amp, freed up enough space to use even more transformers, one for each function; and for the development and use of huge film capacitors for the high voltage power supply.
The Mono amps cried out for a superior quality preamplifier. What better than a DHT for line level duties. Low gain, and low output impedance. The Russian 4P1L, a relatively unknown directly heated power pentode, connected in triode mode, served the bill perfectly. The tonal colour and saturation from this tube is just amazing. It takes the overall sound performance of an audio system to new levels.
Lyrita Audio is having a listening session, featuring these products, on:
Sunday, December 18, from 11:00 to 14:00 hours. All are welcome.
Some pictures are attached, one of the interior of the amp. The wiring uses full advantage of the 3-dimensionality of space.
GM70 SET Mono Amp - single ended power amplifier with a power output of 35 watts, using the Russian GM70 directly heated triode. Two stage design, with a triode connected 6E5P driver tube, coupled through an interstage transformer to the GM70 output tube. Separate transformers for high voltage, for filament current, for bias voltage.
DHT Line Preamplifier - line level preamplifier using the Russian directly heated 4P1L tube, connected as triode. Very simple signal path, capacitor coupled output. No feedback. 6 dB gain. Output impedance 1250 ohms.
The mono amps were developed, again on request from a customer, for more power from a single ended tube design. The Russian GM70 transmission tube, similar in rating to the 845 transmission tube, turned out to be a great contender. Easily available, very sturdy construction, inexpensive. Using the stereo chassis for the mono amp, freed up enough space to use even more transformers, one for each function; and for the development and use of huge film capacitors for the high voltage power supply.
The Mono amps cried out for a superior quality preamplifier. What better than a DHT for line level duties. Low gain, and low output impedance. The Russian 4P1L, a relatively unknown directly heated power pentode, connected in triode mode, served the bill perfectly. The tonal colour and saturation from this tube is just amazing. It takes the overall sound performance of an audio system to new levels.
Lyrita Audio is having a listening session, featuring these products, on:
Sunday, December 18, from 11:00 to 14:00 hours. All are welcome.
Some pictures are attached, one of the interior of the amp. The wiring uses full advantage of the 3-dimensionality of space.
Attachments
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