Hi misterX What you say make sense, I need more time to trace the wiring of the meter. What I am guessing is that the auto biasing circuitry will maintain the current flow to be identical to go into the two power tubes, and the meter is to monitor the +ve signal tube (which should then be...

from my experience with the LD6+, so not necessary relevant to your LD8 1. The meter monitors the loading current in two power tubes only, those which are for +ve signal current amplification 2. The loading current in the power tube depends on - the power tube itself - plat voltages at pin #2...

thanks everyone who have responded to my post. I was wrong about the protection circuit. I did some research on the part CI237HA and tried to trace out how the protection circuit work by tapping the +ve and -ve signal out directly without passing through the protection circuitry. 1. Each...

The protection circuit in the middle of the photo, the black objects are housing the fuse and the relay

An update of the fault finding for my LD6+ 1. The voltage to all driver tubes are correct 2. The fault did not appear to be related to the wiring of MJ15020/21 I was suspecting that there was something wrong related to the output relay protection circuit. The design of this protection circuit...

Dear Maxx134 That's excellent found, wish that would fx the problem, will try out tomorrow as I have left my LD at work place. Big thanks again.

I have not touch the small 47uF cap, yes it is there. Here are my part list got replaced in my LD6+ Power supply section 2x EPCOS 100uF 450V capacitors (smoothing caps dor the two driver tubes, replaced the 100uF 450V Rubycon KXW) 2 x Kendeil 330uF 400V (replaced the 330uF 250V Nippon Chemicon...

Yes, they are 12w resistors from Mils

Help.. After upgrading the 330ohm resistors, 0.22uF capacitors and all the power supply related electrolytic caps, I have no sound coming out but buzzing. The two meters' reading are normal. I am now in the process of diagnosing the problems. Can anyone help to measure the power and driver...

I have heard a HD700 sound really good with the Fostex A8 amp, the HD700 was connected to the A8 with a DIY cable made with mogami 2534. The DIY cable was terminated with 2x TRS jacks, one jack wired for left channel and the other for the right channel, both jacks connected to the two phono outs...

Last night, my friend brought his Oyaide to my place and swap out my stereolab xv ultra. Don't like the DB-510, much prefer my xv ultra with more air, better image and more dynamic with no digital glare.   The gent who sold his xv ultra to me bought a AU24.     Quote:

  Quote: My system is all ACSS, from CD to power amp. Using #2 BNC as well. The improvement in using xv ultra is not just sound of different "taste". It really lift up everything significantly. In comparing to xv, the canare is dull and boring. I have also tried out some ebay pure...

  Quote: The CD7 + REF7 combo is amazing. What digital cable are you using? I had the stock canare BNC 75 ohm cable, it was OK. I don't usually spend big money (more than $100) on digital cable. However, after trying out my friend's sterveox xv ultra, I bought one myself, and...

SB3->REF3->REF7->C3->C1 I do not have the a-gd DI but the a-gd REF3.With the REF3, SB3 sounds much less digital, this is my connection,