Now they are playing! 🎺🙂🎸
Got them up and running yesterday evening, slowly with variac ramp up, with the chicken bias resistors. Sounded very fine. Promising. Gave them some runtime flipped ON all night.
Switched today to the 1,85A Babelfish bias instead of the 0,7A Chicken bias.
All i can say is that this is a sweet sounding amp. A friendly, collected and smooth yet extremely clean sound. Never hard and cold. The bass is very, very muscular, strong and fat. Never in a bass bosted way, flappy way. No, just CLEARLY present, authoritative and dynamic.
This is in closest comparison with the EL34 SE amp i had playing in the system just before these MF A1 Babelfishes got warmed up for real. Heatsink settles on 40C @ 1,85A. 🙂
The only clear downside with the power transistor spring steel clips that i now can see, is that i can no longer see and check out the really beautiful transistors. So good thing that i already got them on nude photos in this very thread. 🙂🙂🙂
Got them up and running yesterday evening, slowly with variac ramp up, with the chicken bias resistors. Sounded very fine. Promising. Gave them some runtime flipped ON all night.
Switched today to the 1,85A Babelfish bias instead of the 0,7A Chicken bias.
All i can say is that this is a sweet sounding amp. A friendly, collected and smooth yet extremely clean sound. Never hard and cold. The bass is very, very muscular, strong and fat. Never in a bass bosted way, flappy way. No, just CLEARLY present, authoritative and dynamic.
This is in closest comparison with the EL34 SE amp i had playing in the system just before these MF A1 Babelfishes got warmed up for real. Heatsink settles on 40C @ 1,85A. 🙂
The only clear downside with the power transistor spring steel clips that i now can see, is that i can no longer see and check out the really beautiful transistors. So good thing that i already got them on nude photos in this very thread. 🙂🙂🙂
Sissy 0A75 initial, good
second, you did put those 240K in, even better
then write..........what spks, and rest?
as I see it, that's the praise
second, you did put those 240K in, even better
then write..........what spks, and rest?
as I see it, that's the praise
Thats a long story that i will save for another day.🙂
But i can clearify that the EL34 SE compairson that just happened by random is a somewhat useful one, i think. I like to switch around amps and speakers now and then to keep things fresh. And. Its not bad at all to perform considerably better than the classic smooth operator like the EL34.
But all of this is of course 100% personal opinions. 🙂
But i can clearify that the EL34 SE compairson that just happened by random is a somewhat useful one, i think. I like to switch around amps and speakers now and then to keep things fresh. And. Its not bad at all to perform considerably better than the classic smooth operator like the EL34.
But all of this is of course 100% personal opinions. 🙂
enjoy!
btw. no really need for isolators in between M's and their heatsinks
quite contrary, no isolator and blob of goop
Okey, thats good to know. 😐
I used customised Keratherm pads. I never continuity tested the metallic backside of the transistor to the pins, since you included 4 Mica insulation pads with the kit. So i just assumed that insulation was needed.
I used customised Keratherm pads. I never continuity tested the metallic backside of the transistor to the pins, since you included 4 Mica insulation pads with the kit. So i just assumed that insulation was needed.
well, if ZM is stupid (to send unnecessary parts), no reason for you to be the same
(easy explanation, packing list (any) is usually just edit of some previous ..... so number of resulting errors being measure of involved level of brainpower; that's exactly same reason why you're finding errors in some Papapapers
)
(easy explanation, packing list (any) is usually just edit of some previous ..... so number of resulting errors being measure of involved level of brainpower; that's exactly same reason why you're finding errors in some Papapapers
)
Thanks for sharing your impressions JeyDee. Can you comment on how the sound of this one compares to other amps from this forum?
ZM - in terms of sugar/color, how does this one compare to Scryer?
ZM - in terms of sugar/color, how does this one compare to Scryer?
well, to borrow Papa's Wisdom ( as usual) ..... it sounds darn good
you can be sure in just ine thing, when ZM is in case - I'm posting my drek only if I'm happy with outcome
That doesn't mean that I'm never going to change a thing in it .......
in short - it is same good as Scryer, no question, and almost same level of wakooness, technically
sugar - just enough and right sort, so never boring while you still see Cricket smiling
you can be sure in just ine thing, when ZM is in case - I'm posting my drek only if I'm happy with outcome
That doesn't mean that I'm never going to change a thing in it .......
in short - it is same good as Scryer, no question, and almost same level of wakooness, technically
sugar - just enough and right sort, so never boring while you still see Cricket smiling
Thanks ZM🙏 Now, I am clear on how it sounds ... and I want to see the Crickets 😆
Do you think one or two of these contraptions, with an attached fan, would manage the heat? The A1 looked different so I should try something different from the 5U chassis...
Do you think one or two of these contraptions, with an attached fan, would manage the heat? The A1 looked different so I should try something different from the 5U chassis...
that one thing would keep stereo Krell KSA 50 cold enough, with proper modern 12V fan, so why not puny Babelfish A1, stereo
some care with transistors ,mounting but easy enough
one pcb per side ( as is now), no bent transistor pins and - who knows - maybe you got proper raster
if not, short additional wire studs for transistor pins and all good
see attached, 68mm is magic number, pins to pins
some care with transistors ,mounting but easy enough
one pcb per side ( as is now), no bent transistor pins and - who knows - maybe you got proper raster
if not, short additional wire studs for transistor pins and all good
see attached, 68mm is magic number, pins to pins
Attachments
I have few of those hsinks, shorter and longer
now I'm curious - will measure distance between bars today, just for fun
now I'm curious - will measure distance between bars today, just for fun
Cool. I have been thinking of heat dissipation (xa252...) and want to build something with active cooling for the next amp. The MF A1 seems like a good candidate for a slightly differently packaged amp😊
that hsink on picture, it can cool helluva........ with price of increased fan noise; more heat, more noise
there is no other way than testing, to find does heatsink under test is passing, having intended temp at intended dissipation and still bearable fan noise
that last factor (noise) being subjective, so no prediction from anyone else
so, Variac, fat xformer, set of fat 50W (or so) power resistors ......... and you're good to go
or, just assemble the amp and believe in your luck
there is no other way than testing, to find does heatsink under test is passing, having intended temp at intended dissipation and still bearable fan noise
that last factor (noise) being subjective, so no prediction from anyone else
so, Variac, fat xformer, set of fat 50W (or so) power resistors ......... and you're good to go
or, just assemble the amp and believe in your luck
😍 Those are beautifully milled heatsink and massive! 4 pieces for one BA1?
Will you be kind enough to share with us the fruit of your labour? The Iq that you used and the temperature with these massive heatsinks.
Does the heat spread evenly to the whole heatsink?
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