Hi,just finished my Crack build on the weekend and in the process of burning in the tubes etc,so I can get onto installing the SpeedBall after some time.
This is one sweat sounding amp right of the bat on my Sen's HD650's.If this is how it sounds like now,can't wait to install Speedball and try some tube rolling.
First question I have is regarding voltages on a couple of terminals(mains voltage is 240V). Terminal 9 and B6 are a bit higher than the 10-15% rule.
Amp sounds great so far(also have M'Caps EVO on output).
Other question is how hot should this amp get?
Took some temp readings around amp and in some places its quite hot.Im thinking I should of painted the case plate in high temp paint,I can still smell the metal paint
I used venting off.
Resistance checks were right on the money.
12AU7 tube 131 F
6080 base of tube 125 F
6080 top of tube 203 F
Power trans top 116 F
Case top front 107 F
3K ohm Resistors one 154 F the other 100 F (why the difference in temp from one to the other?)
220uf 250V connected to 14U 136 F
220uf 250V connected to 13U 112 F
220uf 250V connected to 20u 89 F
5W resistor 132 F
Terminal Voltage Actual
1 75-90 90
2 170 169
3 0 0
4 170 168
5 75-90 101
6 0 0
7 100 112
8 0 0
9 100 119 (slightly higher than the 10-15%) rule
10 0 0
11 0 0
12 0 0
13 170 166
14 0 0
15 185 191
20 0 0
21 206 214
A1 90 100
A2 0 0
A4 0 0
A5 0 0
A6 90 88
A7 0 0
A9 0 0
B1 90 88
B2 170 169
B3 100 112
B4 90 100
B5 170 168
B6 100 119 (slighty higher again than 10-15%)
B7 0 0
B8 0 0
Will post some pics when I get around to paint the woodbase.
Thanks.
