by Briansilcox Thu Aug 10, 2023 4:19 pm
I completed the dual rectifier kit wiring /installation last night. When I first set out with documentation, I realized the optional triode pentode switching I had built in originally had to go. While it looks like a big job, it really wasn’t difficult. After reconfiguring the wiring to the output tubes, I had a few questions regarding the optional SCM module, and differences between the VTA70 and 120. Roy very quickly responded, and I completed the wiring of the chokes, etc to installation of the board. The above post clarifies all that.
I powered it up this morning, no issues, and was slightly surprised that no bias adjustments were necessary. I did install a new pair of J&J GZ34s just purchased. I am not really qualified to offer subjective review, but to my ear, I detected a notable improvement in bass response (welcomed). In the year I have run my VTA120, the only issues I have had are one blown rectifier and two fried bias resistors, all easily detected and resolved. I do run the Circuit Specialists variac at 117v, per recommendation of Bob Latino, as my line voltage is about 121v.
I know that Roy is stepping aside to enjoy retirement, I just want to take a second to say thanks…I built my first Dynaco (
ST120) 50 yrs ago age 18, and have seriously enjoyed the kits Roy and Bob have developed for us, and will very likely be building more.