I picked up a hurting Lexicon 412 (Bryston 8BST).
Here's a question I submitted to Bryston. What say you?
I hope I haven't broken any rules here.
Hi,
I have tested the main board on my Lexicon 412 for +56/-56V on all 4 locations and the supplies are good. I metered out all the transistors and diodes on the two bad amp modules. All small transistors and diodes look good. I have 3 totally shorted SJ6521A’s and one SJ6522A.
Questions:
1) What is the best replacement for the SJ6521A and SJ6522A?
2) The pre-driver is a MJE15030 an MJE15031 in all 4 channels. Are these the originals or has someone changed them?
3) Because this amp can be bridged several ways should all channels have the same transistors?
4) Can you sell me 3 good used original SJ6521A’s and 1 good used original SJ6522A and a used good heatsink?
5) I will replace the 3 electrolytic caps. I like the low ESR Panasonic “FC” type. Is that the best option?
What do you recommend as the parts are NLA.
Thanks,
Gary Maffei
Here's a question I submitted to Bryston. What say you?
I hope I haven't broken any rules here.
Hi,
I have tested the main board on my Lexicon 412 for +56/-56V on all 4 locations and the supplies are good. I metered out all the transistors and diodes on the two bad amp modules. All small transistors and diodes look good. I have 3 totally shorted SJ6521A’s and one SJ6522A.
Questions:
1) What is the best replacement for the SJ6521A and SJ6522A?
2) The pre-driver is a MJE15030 an MJE15031 in all 4 channels. Are these the originals or has someone changed them?
3) Because this amp can be bridged several ways should all channels have the same transistors?
4) Can you sell me 3 good used original SJ6521A’s and 1 good used original SJ6522A and a used good heatsink?
5) I will replace the 3 electrolytic caps. I like the low ESR Panasonic “FC” type. Is that the best option?
What do you recommend as the parts are NLA.
Thanks,
Gary Maffei
