I own a pair of used Sound Valves M40 Monoblocks, I am trying to make some modification on it, Please help me to get the schematic of the amplifier, Your helps are greatly appreciated. Many many thanks!
My email address: echo@airiti.com
My email address: echo@airiti.com
I googled Sound Valves and Sound Values (the name of the original company.) I reviewed their VTP-101i pre-amp more than 10 years ago..
Unfortunately they seem to be out of business at this point. I found their old web address and unfortunately it now belongs to a cyber squatter.. www.soundvalves.com
The M40 is very similar to the Dynaco MKIV IIRC, but doesn't use a 7199 but something like a 6AN8 instead? (Again IIRC)
I have seen and heard the M40, but my recollection is more than a little fuzzy since it was more than 10yrs ago.
Try triode connecting the EL34 output tubes, remove the UL taps coming from the output transformers from pin 4 of the EL34's and connect a 220 - 1K resistor from pin 3 to 4. (screen grid to plate) Be sure to insulate the disconnected tap wires well as there is full B+ plus rather a lot of AC audio voltage present when operating.
Upgrade the coupling caps as there are much better ones out there now.
Here is a link to a review of the pre-amplifier (not my review) with possibly useful historical contact info (ignore the email and website addresses obviously):
http://www.hometheaterhifi.com/volume_3_3/v3n3m.html
Sorry, wish I could be of more help.
Unfortunately they seem to be out of business at this point. I found their old web address and unfortunately it now belongs to a cyber squatter.. www.soundvalves.com
The M40 is very similar to the Dynaco MKIV IIRC, but doesn't use a 7199 but something like a 6AN8 instead? (Again IIRC)
I have seen and heard the M40, but my recollection is more than a little fuzzy since it was more than 10yrs ago.
Try triode connecting the EL34 output tubes, remove the UL taps coming from the output transformers from pin 4 of the EL34's and connect a 220 - 1K resistor from pin 3 to 4. (screen grid to plate) Be sure to insulate the disconnected tap wires well as there is full B+ plus rather a lot of AC audio voltage present when operating.
Upgrade the coupling caps as there are much better ones out there now.
Here is a link to a review of the pre-amplifier (not my review) with possibly useful historical contact info (ignore the email and website addresses obviously):
http://www.hometheaterhifi.com/volume_3_3/v3n3m.html
Sorry, wish I could be of more help.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.