Just a note about the Folsom amp.
My son is moving to a house where he now has room to take the GR Research V1s so I thought I would go ahead and set him up with a few other components to get them playing rather than have them use a reciever. He and his housemates are all in their early 20s so they all use their phones as a source. To make this work I have picked up the iFi iOne for Bluetooth duty, this will run into the original iFi iTube preamp buffer which will drive the Folsom Amp.
To ensure the amp is is running correctly, I pulled it out of the closet and checked it over. Afterwards I plugged it into my big system, this is truly an excellent amp. It sounds great running my big system and as an added benefit allows me to break in speakers I just completed without burning up the tubes in my regular amp (Bottlehead Kaiju).
I may need to find another set of boards to build myself a summer amp, it sounds great and does not heat up the room like the Bottlehead.
One thing I would like to change on the amp is the transformer, I am using the recommended Hammond and it has a slight mechanical hum. What other currently available transformers have any of you used that have given quiet operation?
Best,
Ed