here some photos
first interstage its 126C 7,5mA for // parallel E80CC philips made
second interstage LL2756 30mA (43mA actually and very good performances)
output 1629SEA 6K5
no feedback no CCS only triodes and transformers like old golden era
first interstage its 126C 7,5mA for // parallel E80CC philips made
second interstage LL2756 30mA (43mA actually and very good performances)
output 1629SEA 6K5
no feedback no CCS only triodes and transformers like old golden era
Attachments
1KV HT psu:transformer /diode bridge rectifier /3X47uf450V rifa/816 MOV tube/15H 150mA/2X1200uF550V
amplifier schematics: triode/transformer/triode/transformer/triode/transformer
my amps come from inspiration , i use test equipments to check best current
so i do no want war wit people would said """this not good this should be like this"" etc etc
amplifier schematics: triode/transformer/triode/transformer/triode/transformer
my amps come from inspiration , i use test equipments to check best current
so i do no want war wit people would said """this not good this should be like this"" etc etc
Attachments
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You have made a very nice looking pair of amplifiers. Many folks like Lundahl transformers. I have never heard anything bad about them so they must be very good, although I have never used them. Personally I never cared for the open frame look of them. So I would have hidden them under the chassis. Just personal taste. And your circuit description reminds me of certain Japanese builders like Sakuma whom I always appreciated.
yes, of course Sakuma its the continuation of the old golden era
just have a look how things was going on before capacitors and penthodes take over the DHT sound
http://www.bunkerofdoom.com/xfm/UTC_1936/UTC1936.pdf
just have a look how things was going on before capacitors and penthodes take over the DHT sound
http://www.bunkerofdoom.com/xfm/UTC_1936/UTC1936.pdf
Those are beautiful mono blocks, with lots of pretty tubes, and mercury too.
They are so much better with new interstage and output transformers, instead of some of the older ones.
I have used Lundahl, they sounded great.
But I have never spent the money required for Monolith Magnetics, but I hear good things about them.
They are so much better with new interstage and output transformers, instead of some of the older ones.
I have used Lundahl, they sounded great.
But I have never spent the money required for Monolith Magnetics, but I hear good things about them.
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bifiliar IT its perfect input stage if well used.
here +B230V on primary IK 7.5mA
and grounded secondary, no negative bias for 300B.
hard find better, i try LL1692A and prefere 126C
loock much better also
for output transformer i do not like coreC high impedance high voltage
and better EI will give little better from 18KHZ nothing more
for 3X price.
you can always do much better but cost grow quickly
i have small repair shop and my customers are music lovers
no rich prince of oil
if budget was not limited of course i will use beatyfull
cmc aluminium cabinets with gold value parts
here +B230V on primary IK 7.5mA
and grounded secondary, no negative bias for 300B.
hard find better, i try LL1692A and prefere 126C
loock much better also
for output transformer i do not like coreC high impedance high voltage
and better EI will give little better from 18KHZ nothing more
for 3X price.
you can always do much better but cost grow quickly
i have small repair shop and my customers are music lovers
no rich prince of oil
if budget was not limited of course i will use beatyfull
cmc aluminium cabinets with gold value parts
hello 6A3 summer , can you explain wath you means wen you write
"""instead of some of the older ones"""
these transformers are actually in productions
so i buy thems for these monoblock
and my others 4 SE and one PP of GM70 are not dismanteleds
these past made amplifiers make happy music lovers
only one pair monoblock never presented on a forum i made still waiting OPT double core C
wich one of two was faulty, very costly 11Kg OPT linear to 43Khz but isolation was not good
so i do not understand way you write
"""instead of some of the older ones"""
witch """ones"" ???
claudiomas,
No need to worry about the performance of your mono-blocks.
Western Electric used interstage and output transformers in the mid 20s.
Those did not have nearly the performance of today's transformers.
But it did not matter as much then, because the microphones and loudspeakers did not have nearly the performance of today's speakers.
And recorded music did not have the performance of today's signal sources.
The schematics of those original amplifiers can be used today, but probably should be done with modern transformers.
I am sorry for the confusion.
No need to worry about the performance of your mono-blocks.
Western Electric used interstage and output transformers in the mid 20s.
Those did not have nearly the performance of today's transformers.
But it did not matter as much then, because the microphones and loudspeakers did not have nearly the performance of today's speakers.
And recorded music did not have the performance of today's signal sources.
The schematics of those original amplifiers can be used today, but probably should be done with modern transformers.
I am sorry for the confusion.
6A3 summer i work ten years for Sennheiser and Neuman and KleinHummel
you can by very surprised of the quality of very old transformers
for filiar intercontinental comunication the quality of golden era triodes and transformers are still unbypassed
so i do not worry about my amplifier but i worry way you constantly criticize old school masters
if you do not like tubes and transformers so there are integrated circuits for cheap wireless solid state amplifiers no THD no HUM and plenty of watts
get a try and compare music
transformers are like musical instruments, manufacturers are artists
so please little more respect for thems
you can by very surprised of the quality of very old transformers
for filiar intercontinental comunication the quality of golden era triodes and transformers are still unbypassed
so i do not worry about my amplifier but i worry way you constantly criticize old school masters
if you do not like tubes and transformers so there are integrated circuits for cheap wireless solid state amplifiers no THD no HUM and plenty of watts
get a try and compare music
transformers are like musical instruments, manufacturers are artists
so please little more respect for thems
If you want to listen to AM radio, this is quite true. If you want to reproduce content below 100Hz or much above 5kHz, then the really old transformers aren't a great choice.
The old school masters didn't just stop transformer development, the process continued (and still does today).
This is called "trolling".
This is one of those statements that is neither true nor false. I could also say that a cow is like a musical instrument.
I thought you were defending dead transformer deisgners? (They didn't do the manufacturing)
The best transformer designers that I have worked with have elaborate spreadsheets and models to design their iron. The guys in the 20s would've donated a kidney to have that kind of technology at their fingertips!
Nice work claudiomas.
The most important thing is that you are happy how the amplifier sounds.
Long ago (in Sakuma-San era) I made a 300B PP amplifier with all Lundahl irons. LL1544A as input transformer, E182CC as a driver, LL1660S as IT and LL1620PP OPTs.
I remember, input and interstage transformers in my amplifier sounds good only in a step-down configuration. Even 1:1 ratio was not good for me.
The most important thing is that you are happy how the amplifier sounds.
Long ago (in Sakuma-San era) I made a 300B PP amplifier with all Lundahl irons. LL1544A as input transformer, E182CC as a driver, LL1660S as IT and LL1620PP OPTs.
I remember, input and interstage transformers in my amplifier sounds good only in a step-down configuration. Even 1:1 ratio was not good for me.
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