Bottlehead Forum
Bottlehead Kits => Legacy Kit Products => Paramount => Topic started by: vpeele on October 27, 2014, 05:18:50 AM
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Hi All, I think I have big resistance problems. Please help.
left amp 300b right amp 300b pdf manual
terminals
1. reading keeps raising reading keeps raising *
5. .999 meterset@2k 01.0 meterset@200k 1k
6. 1.113 meterset@2k 1.120 meterset@2k 1118
7. .248 meterset@2m .248 meterset@2m 249k
9. reading jumps around 297 meterset@2m 124k
10. 0 meterset@2m .000 meterset@2m 0
11. no reading @ any setting no reading 3.0
12. no reading no reading 5.6m
13. 0 0 0
14. no reading no reading 9.2m
15. no reading no reading 15m
16. no reading reading increases *
17. 0 0 0
18. 0 0 0
19. .300 .297 meterset@2m 128k
20. .248 meterset@2m .248 meterset@2m 249k
Tubes left chan right chan
300b
A1. 1.012 meterset@2k 1.018 meterset@2k 1027 300b
A2. no reading no reading *
A3. 249 meterset@2m .248 meterset@2m 249
A4. 1.012 meterset@2k 1.018 meterset@2k 1028
B1. 0 0 0
B2. 9.84 meterset@20k 9.71 meterset@20k 8.2k
B3. .248 meterset@2m .248 meterset@2m 249k
B4. .299 meterset@2m .297 meterset@2m 130k
B5. 0 0 0
B6. .299 meterset@2m .316 meterset@2m 177k
B7. .232 meterset@2k 229 meterset@2k 220
B8. no reading no reading *
B9. 0 0 *
Thanks for any help!, vpeele
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Hi All, I think I have big resistance problems. Please help.
left amp 300b right amp 300b pdf manual
terminals
9. reading jumps around 297 meterset@2m 124k
19. .300 .297 meterset@2m 128k
B4. .299 meterset@2m .297 meterset@2m 130k
B6. .299 meterset@2m .316 meterset@2m 177k
B9. 0 0 *
This is a list of terminals that are actually different than what the manual specifies.
0 on B9 is OK, you should see about the same thing on B1.
The B6 reading is OK, there are enough complex components in there that something much higher than 0 is ok.
The B4 reading is disturbing. There should be a 300K resistor from OB to -reg, is it present? What's your resistance reading from -reg to ground?
19 and B4 are wired together.
9 is also wired to 19/B4.
-PB
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Hello PB, 300k (or,bk,y,go) is installed at OB to -reg. Resistance reading from -reg to ground is 0.
{The 300k resistor reads 300 @ metersetting 2m.}
Yes 19 and B4 are wired together. Yes 9 is wired to 19/B4.
I will keep inspecting all solder points and connections.
Thanks for your help,
vpeele
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Go ahead and try the voltage checks.
-PB