AOS Exclusive Review of Eco-Fan Sound Pre-Amp and Power Amp

[Spectral Morn]

Okay, I have borrowed a friend's 6A3 amp as above for comparison with this new amp. The new one sounds every bit as powerful, perhaps more so I think. Swapping quickly many times between the two amps while pausing on a range of music DVDs I find I do always much prefer the new amp. While there is nothing in it as to the top end, this amp sounds fuller and clearer. Without the 2nd harmonics I would guess. The bottom end sounds bigger and more extended. I think it has a warmer and fatter sound, perhaps more "friendly". More three-dimensional?
I'll try to get a perfected one over for a review in the coming year.
This is the BSE! It stands beside the SEOTL.

That would be very interesting


Regards D S D L

[Giant Haystacks]

i have 2 friends going to auckland in the new year and i have given them 6 bottles of the local n.ireland bushmils whiskey for you to keep all the engineering going.
it was below zero here and i had to put a heating bulb in the roof space .i will have to try to get a set of your single ended otl power amps for next year.
it will be nice to hear your new amp when you finish proto typing keep well murray

[Jack Williams]

More compareings of the amps. I thought they were a bit "apples and oranges" in that the 45 is a polite friendly bottle anyway, compared with the more up-front 6A3.
So the other night I just tried plugging in a set of 2A3s. They're about midway between 45s and 6A3s in sound.
The amp came alive! The intermodulation basically disappeared, probably because of the extra headroom. I thrashed on into the night...
In the morning I checked it out on the bench. Really only a small tweak on a couple of settings optimized the best power/waveform/balanced clipping syndrome. You are hogtied in direct coupled as to the class the output is running in. The 2A3s are cruising with only 45ma plate current and 150 volts across, where the 45s are pushed at 40ma and 150 v. That's with the full 400v HT, but the 45s are backed off to a lot less. However the 2A3s don't mind the full volts, so I get a good five watts.
WOT! No more than one bottle in the amp above?
Ah yes, BUT! Firstly the bottles are cruising compared to the one in the6A3 amp. But you also get a choice between two quite different sounding amps of similar power. Adam thought the 6A3 was "etherial" and the BSEA sounded "HiFi". Whatever that is..

[Jack Williams]

A happy Christmas and a merry New Year to all!

[Jack Williams]

i have 2 friends going to auckland in the new year and i have given them 6 bottles of the local n.ireland bushmils whiskey for you to keep all the engineering going.
it was below zero here and i had to put a heating bulb in the roof space .i will have to try to get a set of your single ended otl power amps for next year.
it will be nice to hear your new amp when you finish proto typing keep well murray

Francis:
Three bottles each will be duty-free.
Murray.
PS: They'll help me get my Steam-powered turntable up and running.(Don't laugh!)

[Jack Williams]

A check of the junk room came up with these bits. The platter from Collaro's version of the Garrard 301 and Garrard bearing. Very heavy, being die-cast metal. A good reason to play with model stream. Never had something to drive, before another guy in a hobby mag made one. His however is a pretty bad sound. I have a good low mass arm to go with this one.

[adam_ecofansound]

greetings from the sunny southern seas,

here is a link to picture and video of aucklander simon jansens' handsome, (but aurally iffy), steam powered turntable - the inspiration for 'jack williams' current efforts mentioned above.

http://trialbysteam.com/2010/12/05/s...record-player/

quite lovely to look at...

adam

[adam_ecofansound]

hi,

for your mild amusement,

a

[Spectral Morn]

Regards D S D L

[Jack Williams]

Nothing much to say to that.