If you are thinking of DIY mods,I would get a copy of the POOGE article done by Marsh and Jung. You can do easy tweaks, not so easy tweaks, and highly-experienced-tech tweaks. I use a 12au7 based triode pre-amp and I believe that a tube pre with a ss power amp makes the music MUCH better. I had the Hafler DH101 preamp (for a very short time) and it sounded way too harsh. I have had my DH200 for 23 years and never any problems. Even some of the easy mods (different input/output terminals) do make a difference. Also, carefully clean the pins on the mosfets, the difference after twenty years of crud removed is something to hear. Good luck.
Maintenance on Hafler DH200 & DH101
I just acquired these two units from a friend. Just wondering if there is anything I should do to maintain them. I plan on cleaning all the switches with deoxit. I was told by a local repairman that the caps shouldn't need replacing, but I'm not sure what he bases that on. Any suggestions based on experience? Also, can anyone comment on the sonic signature of these two pieces?
Thanks, Peter
Thanks, Peter