Any luck finding schematics? I own a pair of 105's. Sound great. Problem is my pair is mismatched, each from a different iteration/generation. Power supplies pretty much identical, but one of the boards has a heatsink along botton and uses RCA transistors while the other relies solely on the case for heasinking and has motorola? transistors. Seems one amp is higher gain than the other... I see 2 potentiometers on the board. Curious is I could learn to bias them to same level. Or, somehow level match them. Shame because I love them, but the imbalance is noticeable and bothersome.
I took the cover off to refresh my memory... wish I had the patience to reverse engineer it into a schematic. half dozen small transistors with some having a star heatsink. A definitely hand made appearance to the pcbs - some jumper lines on topside with components and curvy lined etched traces below. Wonder what a 103 looks like inside... a quick check on voltage rails shows it's +/-52
Meridian Schematics
Hi CS,
Did you get the schematics you were looking for? I emailed Boothroyd Stewart and they sent me a photocopy of the schematics for my amps. To tell you the truth I can't remember the model number but they are the two piece 100watt mono amps (brown colour). I'm at work right now, but when I get home I'l see if I can find the schematic and fax it or email it if I can get it scanned.
buzzwell
Hi CS,
Did you get the schematics you were looking for? I emailed Boothroyd Stewart and they sent me a photocopy of the schematics for my amps. To tell you the truth I can't remember the model number but they are the two piece 100watt mono amps (brown colour). I'm at work right now, but when I get home I'l see if I can find the schematic and fax it or email it if I can get it scanned.
buzzwell
Meridian 105
I have a pair of 105s and I believe, I am having trouble with the bias as well. One of them heats up and after a soft pop, cuts out until it cools down again and kicks back in.
I have a schematic but not the knowledge to use it. I have just sent them in to a shop here in Vancouver to see if they can set them up. Mine have the heat sinks on the bottom (of both) as well. They have a number on paper tag on the bottom 1689 A and B. I have had them for about 15 years I would guess.
I have a pair of 105s and I believe, I am having trouble with the bias as well. One of them heats up and after a soft pop, cuts out until it cools down again and kicks back in.
I have a schematic but not the knowledge to use it. I have just sent them in to a shop here in Vancouver to see if they can set them up. Mine have the heat sinks on the bottom (of both) as well. They have a number on paper tag on the bottom 1689 A and B. I have had them for about 15 years I would guess.
An old thread revivial here...
Does anyone know of a modification for the 105s? An ebay listing that ended today talks of the amps having had an E-mod (to make them revision E) in the late 80s (after being out of production).
The listing says this:
Heres a photo of the board:
Does anyone know of a modification for the 105s? An ebay listing that ended today talks of the amps having had an E-mod (to make them revision E) in the late 80s (after being out of production).
The listing says this:
Heres a photo of the board:
Attachments
