Search found 8881 matches
- Thu Dec 29, 2011 9:23 pm
- Forum: Valves
- Topic: SRPP Series Shunt Reg Anyone?
- Replies: 56
- Views: 22694
In the still pic, the three 75v VR tubes are in the little chassis in forground the 830b on the wooden breadboard. In the first video this version which has 100mA shunted by the 830b is playing. In the second video the two british VR tubes are doing all the shunt work. In both cases the mechanism by...
- Thu Dec 29, 2011 8:26 pm
- Forum: Valves
- Topic: SRPP Series Shunt Reg Anyone?
- Replies: 56
- Views: 22694
By the way the last cap shouldn't be necessary if you shunt as much current as your amp demands. I did manage to breadboard a power supply capable of providing for an output stage of 260v 50mA using two of the venerable old British 4 pin regulators pulling about 50mA. I just chopped and changed the ...
- Thu Dec 29, 2011 8:14 pm
- Forum: Valves
- Topic: SRPP Series Shunt Reg Anyone?
- Replies: 56
- Views: 22694
The 5k6 resistor you got the idea from the plate load of the error amplifier in a conventional series pass design. It is without purpose here. Unless you are using it to strike the VR tubes. This is not necessary. The 6080 when it heats up will pull sufficient current to strike the VR's and plenty t...
- Tue Dec 27, 2011 9:06 pm
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
Just mulling this over, the 12E1 Triode connected would have a max g2 voltage 300 max current 100 mA max dissipation 35 Watts. Be less hungry for filament and less likely to create the problems Nick experienced. Colomore used to have bucket loads of these and tried touting them as TT22 alternatives...
- Tue Dec 27, 2011 9:06 pm
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
Just mulling this over, the 12E1 Triode connected would have a max g2 voltage 300 max current 100 mA max dissipation 35 Watts. Be less hungry for filament and less likely to create the problems Nick experienced. Colomore used to have bucket loads of these and tried touting them as TT22 alternatives...
- Sat Dec 24, 2011 3:12 pm
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
Anyway I have just thought of a brilliant plan. Build an output stage of 12e1 with a 75c1 as it's cathode bias and complement that with a shunt valve the same. So either side of the transformer primary two identical setups will see saw. But for simplicity of construction the power supply will be LCL...
- Sat Dec 24, 2011 3:06 pm
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
- Sat Dec 24, 2011 2:59 pm
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
I wish it wasn't so blinking cold on the top floor of my house or I would go up there and breadboard the shunt element to let you know what current it pulls from a 360v B+. i am just really worn out after working away long time doing 12 hr days and am at last home body has gone into a metabolic rate...
- Sat Dec 24, 2011 2:56 pm
- Forum: Speakers
- Topic: OB Picture Gallery and Design Philosophy Discussion Thread
- Replies: 153
- Views: 54573
- Sat Dec 24, 2011 2:48 pm
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
- Sat Dec 24, 2011 2:45 pm
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
- Sat Dec 24, 2011 2:42 pm
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
- Sat Dec 24, 2011 2:18 pm
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
- Sat Dec 24, 2011 10:53 am
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
Might just fall into place. I think Steve has some 12e1's, if not I can send some. One consideration of the SP 211 amp is the use of 211 to return ac. We so often neglect to realise that the other (b+) side of the opt in a se amp has as much influence on Sound . Same valve as output valve makes sense.
- Sat Dec 24, 2011 10:47 am
- Forum: Valves
- Topic: Shunt Reg Using a 13E1 as Shunt Element
- Replies: 70
- Views: 30645
Might just fall into place. I think Steve has some 12e1's, if not I can send some. One consideration of the SP 211 amp is the use of 211 to return ac. We so often neglect to realise that the other (b+) side of the opt in a se amp has as much influence on Sound . Same valve as output valve makes sens...