Well well; alot of similarity, ECL82 7W per channel. Drop-through o/p trannies; home-made mains tranny different orientation. Not a touch of hum..Fixed bias operation.
squad= balanced input trannies: front end 12GN7 as triode; split load p/s ECC88. I like the sound but 8K primary is a touch soft on the upper register, neverless an easy amp to build with a remarkable performance and sounds astonishingly loud and clean when put against a 20 Watter.
richy
squad= balanced input trannies: front end 12GN7 as triode; split load p/s ECC88. I like the sound but 8K primary is a touch soft on the upper register, neverless an easy amp to build with a remarkable performance and sounds astonishingly loud and clean when put against a 20 Watter.
richy
Attachments
My Black Velvet OTL headfones amplifier
6H13C & Rare CV200/600 & PCC88 Siemens /yellow pins/
OTL for headphones 200 and more ohms. Loftin-white, only 1 cap ELNA CE between output stage and headphones.
Picasa Уеб Албуми - Azazello - amplifiers
6H13C & Rare CV200/600 & PCC88 Siemens /yellow pins/
OTL for headphones 200 and more ohms. Loftin-white, only 1 cap ELNA CE between output stage and headphones.
Picasa Уеб Албуми - Azazello - amplifiers
12B4 Linestage
First Tube Construction
12b4 linestage built based on threads here. CLCLC Filter with 2x OD3 for 300V B+. Resistive loaded plate with a LM317CCS on the cathode keeping the tube biased at 20mA with 150V plate voltage. Have not played with LED bias yet. Built P2P but embarrased to show it as wiring is UGLY. No hum so I guess it is good enough for now.
Chasis made of Cherry and Maple of local origin.
The gas reference tubes add a very nice light to the amp.
First Tube Construction
12b4 linestage built based on threads here. CLCLC Filter with 2x OD3 for 300V B+. Resistive loaded plate with a LM317CCS on the cathode keeping the tube biased at 20mA with 150V plate voltage. Have not played with LED bias yet. Built P2P but embarrased to show it as wiring is UGLY. No hum so I guess it is good enough for now.
Chasis made of Cherry and Maple of local origin.
The gas reference tubes add a very nice light to the amp.
Attachments
I don't think I've ever posted in the gallery before, so here goes. Of course after looking around a bit I'm left with a decidedly "unworthy" feeling. 
Here's my take on the lilliput amplifier using mostly spare parts that I had around from previous, similar builds. The power supply is a SS rectified, choke filtered design by a friend who also helped tweak the amp circuit to better use parts that I had on had. The chassis is oak with a custom aluminum top plate made by Cam-Expert. I'll try to get the schematics cleaned up in case someone else wants to build a 25lb headphone amplifier.
Here's my take on the lilliput amplifier using mostly spare parts that I had around from previous, similar builds. The power supply is a SS rectified, choke filtered design by a friend who also helped tweak the amp circuit to better use parts that I had on had. The chassis is oak with a custom aluminum top plate made by Cam-Expert. I'll try to get the schematics cleaned up in case someone else wants to build a 25lb headphone amplifier.
Attachments
Thanks! I cut my wiring chops on a few other projects and figured out quickly that while it take a lot of time and effort to end up with a clean layout it really is worth it in the end especially if you have to do any troubleshooting.
And yes, it sounds quite good to my ears.
Here is my first tube amplifier. Tubes have 300V on cathode and power of this amp is 4W per channel to 4ohm load. The weight of all amp is 10kg, it´s quite heavy for moving. I used typical europe tubes PCL86 and ECC83. Brands of tubes are TESLA so I think tubes are from Czechoslovakia. Transformers are from old radio.
. I used typical europe tubes PCL86 and ECC83. Brands of tubes are TESLA so I think tubes are from Czechoslovakia. Transformers are from old radio.An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
