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.