M125 final updates

I've had these for a few years and struggled with some issues. Updates I've recently applied:

Update 1)
Adding auto biasing boards - for me these have proved a godsend. Recurring red plates were a nightmare and costing me a lot. Pre AB boards typical power tube life was 500 - 1000 hours max. With AB boards I'm now 5000 hours plus, still looking to establish an upper limit as they just keep going and going. 
Update 2)
And some cosmetic upgrades...

Just beautiful LeGrace... I can see that wrapping the case with wood is becoming the trend. I also am a big fan and advocate of the AB boards. I love knowing that the bias will adjust as the music signal changes during the song. Some day in the near future, I'll follow jsl1234's lead and relocate the blue AB lights to the top of my case and change to amber to match the glow of the tubes.

Some day in the near future, I'll follow jsl1234's lead and relocate the blue AB lights to the top of my case and change to amber to match the glow of the tubes. wrote:

I considered doing similar until I came to the realization that all I have to do is sight along the right hand edge of the chassis. The LED's cast off enough light to generate a glow within the edge gap and I can confirm their status this way. Having them fully exposed and amber would be cool I admit, but this indirect approach is good enough for me.

I have seen arguments made for and against installing AB boards, all I can speak to is my experience which has been highly positive.

LeGrace wrote:

I considered doing similar until I came to the realization that all I have to do is sight along the right hand edge of the chassis. The LED's cast off enough light to generate a glow within the edge gap and I can confirm their status this way. Having them fully exposed and amber would be cool I admit, but this indirect approach is good enough for me.

I have seen arguments made for and against installing AB boards, all I can speak to is my experience which has been highly positive.



   

I ordered an amber LED. I can assemble them using wires and prepare them for mounting in AB.
I just need to know the lengths of the cables.
If interested, I will send them.

Pavel

Definitely interested. PM sent.

LeGrace wrote:Definitely interested. PM sent.

It will be four amber diodes.
Think about where you want to put the LEDs in the amplifier and write what cable lengths you need.
Pavel

I was thinking to use the two upper bias test point locations on each amp. But when I open the amp to make precise measurements I experience panic attack. What if I were to mess something up? I decide better not to tempt fate. Just continue to enjoy the great performance I am getting from the AB boards.

Member AmpedUp may be interested to stand in on this possibility. Thanks again pavlikkkk for your kind consideration.

LeGrace wrote:I was thinking to use the two upper bias test point locations on each amp. But when I open the amp to make precise measurements I experience panic attack. What if I were to mess something up? I decide better not to tempt fate. Just continue to enjoy the great performance I am getting from the AB boards.

Member AmpedUp may be interested to stand in on this possibility. Thanks again pavlikkkk for your kind consideration.

I am very glad that you enjoy quality sound thanks to my AB.
However, if you still want to insert these amber LEDs into amplifiers in the future, write. I will be glad to help you.
Thank you for the compliment,
Pavel