Originally Posted by wolf18t
Never done it or see it done by someone either.
Keep in mind that every time you will change a set, you will need to re-bias them. You will maybe also have problem mounting them on the heatsinks, if the screws don't align with holes.
There shouldn't be an issue with the holes not lining up. I'm thinking of the transistor and the heatsink being a unit that I "plug in" to the board. So swapping them out would mean I unplug the sub assembly, then take the screw out that holds the transistor to the sink, then attach the new transistor. So it won't be quite as easy as rolling a tube, but easier then soldering
Originally Posted by wiatrob
Holland rolls output transistors. He supplied me with a scoket part number, but I can't recall if it was on aHead-Fi thread or during the prototype discussions...
Really? I have read both SOHA II thread on head-fi and the one on headwize. I'll go look again. Thanks
So apparently it can be done fine, huh? I was worried because I had never heard of anyone using a socket with a transistor.
The deviations from the original design I want to implement are:
1. Socket the transistors.
2. Put a DAC inside the case and use a switch to select the input.
3. Use a switch instead of the jumpers for the heater voltage.
4. Use the larger toriod to support 600ma tube heaters.
5. Use a dual color LED on the e12 delay circuit.
If anyone has any advice on potential issues with any of these, I'd appreciate it. I think I understand the effects of these changes, but I might be missing something.
1. See my previous posts
2. This should be pretty straight forward with a DPDT switch. Planning to use a BantamDAC (at least to start).
3. Easy to implement and already discussed.
4. I just need to get a 1.5a transformer. Any other part changes needed? I also realize this may make it harder to fit the DAC in the Hammond case.
5. This has been discussed, and Alex already posted the schematic to use. I don't anticipate any issues with this change.
Are there any other things I can do to improve the amp? I'm considering different caps, but my understanding is that this mostly benefits coupling caps and this amp doesn't use them. Am I way off here?
I was hoping to get my parts ordered this week, but work was too busy. I'm planning to finalize my BOM this weekend and order on Monday.
Thanks in advance for everyone's help