Peter, here is the VTA MkIII. No schematics. http://www.tubes4hifi.com/MK3.htm
3 posters
http://www.tubes4hifi.com/MK3.htm
solderblob- Posts : 105
Join date : 2018-05-20
Age : 78
Location : Placerville, California
peterh- Posts : 1833
Join date : 2012-12-25
Location : gothenburg, sweden
OK i finally understand, No Dynaco, no schematics, no help from me.solderblob wrote:Peter, here is the VTA MkIII. No schematics. http://www.tubes4hifi.com/MK3.htm
Bob Latino- Admin
- Posts : 3263
Join date : 2008-11-26
Location : Massachusetts
Below is the original Dynaco Mark III schematic ..
Bob
Bob
peterh- Posts : 1833
Join date : 2012-12-25
Location : gothenburg, sweden
What we need is the VTA MkIII schematics. Pictures show that power tube cathodes has separate sensing resistors and that 2 sense connectors is connected to the front panel.
"no bias" at the sens connector indicated that no current flows. ( at least that is my guess that the author is measuring at the sens connector)
Could be a screen stopper that has blown or some bad solders, or in worst case broken output transformer.
"no bias" at the sens connector indicated that no current flows. ( at least that is my guess that the author is measuring at the sens connector)
Could be a screen stopper that has blown or some bad solders, or in worst case broken output transformer.
Bob Latino- Admin
- Posts : 3263
Join date : 2008-11-26
Location : Massachusetts
peterh wrote:What we need is the VTA MkIII schematics. Pictures show that power tube cathodes has separate sensing resistors and that 2 sense connectors is connected to the front panel.
"no bias" at the sens connector indicated that no current flows. ( at least that is my guess that the author is measuring at the sens connector)
Could be a screen stopper that has blown or some bad solders, or in worst case broken output transformer.
OK - I don't have a VTA Mark III schematic .. Maybe Email Roy Mottram directly about this.
solderblob- Posts : 105
Join date : 2018-05-20
Age : 78
Location : Placerville, California
The MkIII works best if you install the tubes in the correct locations which I didn't do 
. A KT88 fits into the same socket as a 5AR4 and vice versa...Problem solved.
. A KT88 fits into the same socket as a 5AR4 and vice versa...Problem solved.
peterh- Posts : 1833
Join date : 2012-12-25
Location : gothenburg, sweden
Glad you found the problem !solderblob wrote:The MkIII works best if you install the tubes in the correct locations which I didn't do
You must be a strong person that can admit mistakes ! We need more such persons !
solderblob- Posts : 105
Join date : 2018-05-20
Age : 78
Location : Placerville, California
Thanks for the help Bob and Peter. Sorry about the confusion!
BTW, Roy supplies a schematic for the mods with the kit. Don't think he publishes it per se.
Dave
BTW, Roy supplies a schematic for the mods with the kit. Don't think he publishes it per se.
Dave
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