I am considering this upgrade and had read some differing opinions over the extra heater current used by the octal tubes. My ST70 (Factory wired from 65) has the smaller little over an in ch stack PA60. some say this is an issue. would I be better off just sticking with the non octal board?
2 posters
upgrading to the VTA 70 driver board with octal sockets
kiwidad- Posts : 6
Join date : 2020-06-01
- Post n°1
upgrading to the VTA 70 driver board with octal sockets
by kiwidad Wed Jun 10, 2020 12:41 pm
Bob Latino- Admin
- Posts : 3277
Join date : 2008-11-26
Location : Massachusetts
- Post n°2
Re: upgrading to the VTA 70 driver board with octal sockets
by Bob Latino Wed Jun 10, 2020 1:55 pm
kiwidad wrote:I am considering this upgrade and had read some differing opinions over the extra heater current used by the octal tubes. My ST70 (Factory wired from 65) has the smaller little over an in ch stack PA60. some say this is an issue. would I be better off just sticking with the non octal board?
Personally I would not recommend the VTA octal driver board if you have an ORIGINAL Dynaco ST-70 with an original Dynaco power transformer. The VTA octal driver board will draw almost 1 full amp of extra current over the standard 12AU7 noval board. This will stress out an already undersized (and 55 year old) original PA-060 power transformer. My recommendation is that you stick with our classic noval VTA driver board.
Bob