As a former owner of several Hafler products (both preamps and amps), I was saddened when David Hafler died. Over the decades since the 1950's, his products and designs made it possible for a lot of audio enthusiasts on limited budgets to enjoy high quality sound reproduction in their homes. His classic tube preamps and power amps are still being used by a lot of people, and provided the basis for the products still being sold by "Audio by van Alstine" (see this link for more info:
http://www.avahifi.com/root/about/greeting.htm)
My last experience with the Dynaco line of preamps and amps was far too many years ago to offer a comment, but I did own several of Hafler's solid state products during the 1980's (which I had modified by Musical Concepts). The Hafler DH-110 was a pretty decent preamp for its price (particularly if you bought the kit and assembled it yourself). It was hardly the last word in transparency or imaging, but it had decent dynamics and was musically accurate. The DH-110 was a much better preamp that its immediate predecessor, the DH-100. I have an old Web site link to a Hafler discussion forum, although I am not sure how active the site is. Here is the link:
http://www.hafler.com/techsupport/forum/default.asp?CAT_ID=6
If I were looking for an inexpensive, used solid state preamp, I would buy an Adcom GFP-565 (which I also owned), which was a much better preamp than the Hafler DH-110. The Adcom 565 is often sold here on Audiogon for around $300, and it offers a fine value at that price.
http://www.avahifi.com/root/about/greeting.htm)
My last experience with the Dynaco line of preamps and amps was far too many years ago to offer a comment, but I did own several of Hafler's solid state products during the 1980's (which I had modified by Musical Concepts). The Hafler DH-110 was a pretty decent preamp for its price (particularly if you bought the kit and assembled it yourself). It was hardly the last word in transparency or imaging, but it had decent dynamics and was musically accurate. The DH-110 was a much better preamp that its immediate predecessor, the DH-100. I have an old Web site link to a Hafler discussion forum, although I am not sure how active the site is. Here is the link:
http://www.hafler.com/techsupport/forum/default.asp?CAT_ID=6
If I were looking for an inexpensive, used solid state preamp, I would buy an Adcom GFP-565 (which I also owned), which was a much better preamp than the Hafler DH-110. The Adcom 565 is often sold here on Audiogon for around $300, and it offers a fine value at that price.