|
OTL Asylum OTL, Output Transformerless Amplifier User Group. |
For Sale Ads |
Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.
Original Message
Ampmeter's fuse blown when check Bias on AS MA-1
Posted by thuan98 on November 6, 2011 at 20:52:15:
Hi all,
I just bought a used vintage MA1 (12 output tubes) with 4 12SX7 modded.
The AMPMETER's fuse (250mA) inside keep blown. I have 2 ampmeters, one is cheapy and other is fancy electrician type. It didn't blow right away, but after adjust and readjust both DC offset and bias, all certain the fuse is out
Anyone has same issue when adjust bias using ampmeter ?
Something is wrong with the amp? Seem like there is some spike in current that cause it, is this normal ?
NOTE: the blown fuse mention here is the one INSIDE the ampmeter
Please advise
Thanks
Thuan