Raul
Active Member
Yesterday, after a few year, I took off the shelf my VoM 1448 to finally complete the recapping. As it has no hum I left the filter can untouched, I already replaced the under-chassis electrolytics and some resistors in the past so this time I replaced the 4 ceramic 0.022 coupling caps. Also for space reason I decided to use the russian k73-16
The amp sounds very good, no noise, channels even, no problems, I checked all the resistors and they were all within spec, so I decided to measure voltages of tubes and can caps.
With my surprise for the 6EU7 and can caps they are definitely lower than the schematics I have (the original one that I bought from Gary of VoM Enthusiast years ago not a Sams), as my amp sounds fine I am wondering if there are variations of this amp or another schematics somewhere (Sams?) that show different voltages or if there is something more I need to check.
Here are my voltages (they were the same also before changing coupling caps):
6AQ5 (these are however within 15%)
pin 2: 10, 10, 10, 10 (schematics 11V)
pin 5: 280, 278, 280, 280 (schematics 250V)
pin 6: 184, 184, 184, 184 (schematics not showed)
6EU7
pin 6: V3: 82 (120), V1 V2: 100 (135)
pin 7: V3: 91 (120), V1 V2: 127, 115 (160)
Can Cap
triangle (30uf): 168 (245)
half circle (80uf) 181 (275)
Square (50uf) 176 (265)
Exit of the rectifiers: 284 (290)
Should I worry about something?
The amp sounds very good, no noise, channels even, no problems, I checked all the resistors and they were all within spec, so I decided to measure voltages of tubes and can caps.
With my surprise for the 6EU7 and can caps they are definitely lower than the schematics I have (the original one that I bought from Gary of VoM Enthusiast years ago not a Sams), as my amp sounds fine I am wondering if there are variations of this amp or another schematics somewhere (Sams?) that show different voltages or if there is something more I need to check.
Here are my voltages (they were the same also before changing coupling caps):
6AQ5 (these are however within 15%)
pin 2: 10, 10, 10, 10 (schematics 11V)
pin 5: 280, 278, 280, 280 (schematics 250V)
pin 6: 184, 184, 184, 184 (schematics not showed)
6EU7
pin 6: V3: 82 (120), V1 V2: 100 (135)
pin 7: V3: 91 (120), V1 V2: 127, 115 (160)
Can Cap
triangle (30uf): 168 (245)
half circle (80uf) 181 (275)
Square (50uf) 176 (265)
Exit of the rectifiers: 284 (290)
Should I worry about something?