My 50 watt all tube guitar amp head and 1x12 cabinet project. the first of probably 4 videos showing me work in about 60 times normal speed for most of it.
Schematic available at: [ Ссылка ]
0:00 - drawing clean channel schematic
0:10 - drawing distortion channel schematic
0:21 - drawing phase inverter and power amp schematic
0:31 - drawing power supply schematic
0:42 - the final schematic
0:49 - making power transformer mounting bracket
1:16 - assembling core to test power transformer
1:33 - soldering a guitar cable
1:46 - making a speaker cable
2:08 - planning the chassis layout
2:37 - winding the 12.6v transformer secondary for the tube filaments
2:54 - assmebling the core to test the 12.6 volt winding
3:03 - dissasembling the core and winding the 625v secondary (1050 turns of wire)
3:36 - insulating the high voltage winding
3:40 - final core assembly
3:59 - soldering the transformer leads
4:14 - planning where to drill holes
4:30 - drilling the relay transformer mounting holes and test-mounting it
4:36 - planning the rest of the holes
4:43 - drilling the tube socket holes
4:57 - de-burring the socket holes
5:09 - mounting the tube sockets
5:42 - plugging in the tubes for fun
5:48 - planning the high voltage capcitor layout
5:54 - mounting the power transformer
6:27 - mounting the relay transformer
There we have it so far....
Some neat stuff,
At 5:34 i cut my thumb with the xact knife and put a long scratch on the chassis
The little black metal tube is a vintage 12sj7 tube, at least 30 years old, probably more
The chassis was previously being used to catch drippings under my bbq in the backyard... i think this is a better use
I took the power transformer from a home stereo reciever i bought at goodwill for $12, then bought $40 worth of copper to make the custom windings. To buy an equialent transformer would have cost me $80 plus $15 of shipping, but it would have looked prettier
The relay transformer is an from an old doorbell power supply
some tech specs for the interested...
Its a 50 watt push-pull power stage using two 6L6GC tubes running at around 430 volts on the plate with a variable fixed bias. There are two separate preamp channels that go through a switching relay to the master vol. then the phase inverter. The clean channel has 1 12AX7 and the 12SJ7, the distortion channel is like the Soldano slo 100 lead channel without the effects loop and with a switch to change the bias on the thrid stage to go between a modern and vintage distortion. It will have a footswitch that will change channels, and toggle the variable master vol boost. the boost boosts the master volume and cuts some of the vnegative feedback going to the phase inverter (relay controled). The cabinet will be a 1x12 with a 12" Eminince "The TOnespotter" speaker.
