Below is a pic of my single ended ultralinear amp with cathode feedback using the output transformer secondary. Output stage is a new production Tung-Sol 7581A.
Input/driver is a British mesh-plate globe MH4 from the mid 1930s.
There are separate choke-input power supplies: one for the input stage and a glow tube shunt regulated one for the drivers.
Input/driver is a British mesh-plate globe MH4 from the mid 1930s.
There are separate choke-input power supplies: one for the input stage and a glow tube shunt regulated one for the drivers.
Attachments
My Elekit TU-8200R Tube Amp Kit
I swapped power tubes to Sophia Electric Coke-bottle KT88-ST and driver tubes Genalex-Gold Lion B749/ECC82/12AU7 (Made in Russia) also upgraded resistors to Takman 1% metal film and coupling capacitors with Mundorf MCap Supreme EVO Aluminum and I must say the KT88 tubes is far superior way much better in my opinion and sounds really good than the stock JJ’s that comes on this kit. Listening to new album “Wallflower” by Diana Krall and old album “Orgy In Rhythm” by Art Blakey recorded 1956, Paul Desmond “Bridge Over Troubled Water” recorded 1968 the sound is rich and detailed, superb imaging realistic bass, piano and alto saxophone smoothed good instruments separation the vocal is so clear is just like the singer is singing in front of you large soundstage very clean no noise/hum driving the Triangle Borea BR3 speakers 8 ohms 90db sensitivity and this amp can deliver powerful output rated 8 watts. The source of music are analog out of BlueSound Node 2i streamer with Parasound Zpre3 preamp also tested listening it with EVGA Nu Audio Soundcard analog out with upgraded Burson V5iD hybrid OPamp, the sound of TIDAL MQA Masters lossless audio is superb on all variety of music. Next project is to build a matching Elekit TU-8500 Tube Preamplifier
I swapped power tubes to Sophia Electric Coke-bottle KT88-ST and driver tubes Genalex-Gold Lion B749/ECC82/12AU7 (Made in Russia) also upgraded resistors to Takman 1% metal film and coupling capacitors with Mundorf MCap Supreme EVO Aluminum and I must say the KT88 tubes is far superior way much better in my opinion and sounds really good than the stock JJ’s that comes on this kit. Listening to new album “Wallflower” by Diana Krall and old album “Orgy In Rhythm” by Art Blakey recorded 1956, Paul Desmond “Bridge Over Troubled Water” recorded 1968 the sound is rich and detailed, superb imaging realistic bass, piano and alto saxophone smoothed good instruments separation the vocal is so clear is just like the singer is singing in front of you large soundstage very clean no noise/hum driving the Triangle Borea BR3 speakers 8 ohms 90db sensitivity and this amp can deliver powerful output rated 8 watts. The source of music are analog out of BlueSound Node 2i streamer with Parasound Zpre3 preamp also tested listening it with EVGA Nu Audio Soundcard analog out with upgraded Burson V5iD hybrid OPamp, the sound of TIDAL MQA Masters lossless audio is superb on all variety of music. Next project is to build a matching Elekit TU-8500 Tube Preamplifier
Attachments
6N16 phono preamp
807 is such a classic beauty!
I managed to revisit and finish a little project I left a couple of years ago due to luck of time.
It's a phono preamp designed by Koifarm with pcb provided by Boydk, here and here, based on 6N16 miniature tube.
Also added an MC pre-pre stage based on the same tube as I mostly use mc cartridges
Looks don't say much but it plays beautiful
807 is such a classic beauty!
I managed to revisit and finish a little project I left a couple of years ago due to luck of time.
It's a phono preamp designed by Koifarm with pcb provided by Boydk, here and here, based on 6N16 miniature tube.
Also added an MC pre-pre stage based on the same tube as I mostly use mc cartridges
Looks don't say much but it plays beautiful
Attachments
Hi Andy,
OPTs are old style multiple secondary, Hammond 1627SE, wried for 4R, with 8R speakers to give a 5K reflected load.
807 is such a classic beauty!
I managed to revisit and finish a little project I left a couple of years ago due to luck of time.
It's a phono preamp designed by Koifarm with pcb provided by Boydk, here and here, based on 6N16 miniature tube.
Also added an MC pre-pre stage based on the same tube as I mostly use mc cartridges
Looks don't say much but it plays beautiful
Looks very good.
Very nice Amp Steve congrats, I am just been curious but what are for the small tubes on the right? .....all the best
The small tubes on the right are gas-discharge voltage regulator tubes, and are part of the input stage power supply. These tubes were the forerunners to zener diodes. The two on my amp are valued at 150V and 75V, which means that series connected, as a shunt reg stack, they maintain a steady 225V supply to the plates of the two input valves.
