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In Reply to: RE: Eico HF-32 vs HF-52 posted by rockdoc on March 23, 2014 at 14:10:34
My first hifi amp was one HF-52 (glorious mono) in high school. Wish I still had it. Wish I had two! ;-) Nice to have a plethora of EQ options if you're at all interested in the pre-LP world. Plus, it has variable loudness.
The HF-32 is an odd bird - push-pull parallel EL84 to get up in the vicinity of 30 wpc. I am sure it is a fine amplifier; I've never heard one... so my recommendation's not very scientific... but it stands. ;-)
all the best,
mrh
Follow Ups:
My gut feeling is the HF-32 with 4 EL-84s per side is too many tubes; too much matching; too many sockets etc. Haven't heard much about it anywhere though.
I also just sold a pair of Acro TO-330 output trannies; I have read many times that the Chicago (?) trannies on the HF-50 and HF-52 were as good or better.
They were close to the Acro or Dynaco X-formers; but got into core saturation a little sooner at the low end, and seemed to have more leakage inductance at high frequencies. An HF-50 compared very well to a Dynaco Mk II with EL34's in both.
Jerry
with all my heart that the HF50 Chicago iron is unquestionably sonically superior to the HF60 Acrosound iron. I have five HF50s and I rebuilt two pairs,two different ways. I have one pair of HF60s and I rebuilt those with an all film cap power supply as I did the one pair of HF50s.
In both cases,the Hf50 is fuller sounding with a more natural sweep of tonality.The HF60s are also nice sounding amps but,not nearly as nice as the HF50s IMHO..
Honest amplification is better than excessive 2nd order distortion anytime.
So, think I should rebuild the HF-52s as KT-88 monoblocks, or rebuild the preamp sections too? How does the HF-52 preamp (s) compare to the HF-85, or the preamp section in the HF-81, or my current 400C? My plan, and gut feeling all along with these was to eventually build them as HF-50 clones.
I would rebuild those as mono blocks and use Dave Gillespie's schematic for the HF60s which will work just fine.
Honest amplification is better than excessive 2nd order distortion anytime.
Thanks Mike,
I looked at the Dave Gillespie mod, and will probably do that. I have a bunch of KT-88s, KT-90s and 6550s and they are looking for an amp!
You will also be able to run 6L6s and its several variants such as the 6P3S-E and the 6L6GC and the 5881 as well.
Honest amplification is better than excessive 2nd order distortion anytime.
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