sr100 is very good ampli in sound details and quality
i made it last year
but i make a23 now and a23 is better than sr100
a23 is very nice
sr100 is VFA but A23 is CFA and each one have their characteristics.so there is no better
in perevious pages one of members made sr200 and a40 and differences were negligible
a40 is more complex than a23
i build the SR100 but there are some problems
i set the bias voltage on 0.33 ohm resistor to 10mv
signal ground is connected to psu by a seperate wire than power ground
output dc voltage is 0.6mv which is good
but there is a noise when no input connected which i can hear that from 1 meter distance
also when i connect speaker to amplifire bias voltage on 0.33ohm drop to 0.1mv!
when i touch input signal pin a very very loud bloop come out from speaker
when i shorted input pins(no speaker connected) bias voltage goes up around 170mv and series bulb lights on
are these problems normal or there is something wrong?
i set the bias voltage on 0.33 ohm resistor to 10mv
signal ground is connected to psu by a seperate wire than power ground
output dc voltage is 0.6mv which is good
but there is a noise when no input connected which i can hear that from 1 meter distance
also when i connect speaker to amplifire bias voltage on 0.33ohm drop to 0.1mv!
when i touch input signal pin a very very loud bloop come out from speaker
when i shorted input pins(no speaker connected) bias voltage goes up around 170mv and series bulb lights on
are these problems normal or there is something wrong?
Good luck ;-)
SR200 looks too powerfull for my needs. Might go the SR100 way too.
@ saminnografix,
Thanks for your comment. SR100 is too high too! Well, will also check less powerful amplifiers then. AFAIK speakers are in the low 90dB.
Thanks for your comment. SR100 is too high too! Well, will also check less powerful amplifiers then. AFAIK speakers are in the low 90dB.
@still4given, and others,
What kind of 'tape' do you put between transistors and heatsink? Looks convenient. I don't seem to find a similar one 🙁
https://www.diyaudio.com/forums/attachments/solid-state/821028d1582945061-studio-reference-amplifier-sr150-solder-top-jpg
What kind of 'tape' do you put between transistors and heatsink? Looks convenient. I don't seem to find a similar one 🙁
https://www.diyaudio.com/forums/attachments/solid-state/821028d1582945061-studio-reference-amplifier-sr150-solder-top-jpg
Ah Kapton, thanks, forgot about it as film, mostly used it as thin tube.
Will check where I can find that around here.
Will check where I can find that around here.
Bais problem solved
At last its working. The problem is solved. I must say this is one of the best amp in its class.
I have set about 24.4 mV across the 0.68ohms x 2 (parallel) resistors. I hope this is fine. Now i need to find the PCB of regulated Power supply which can feed both my channels. Can someone guide me to the post number where I can find the PCB for itching with help of toner transfer method.
At last its working. The problem is solved. I must say this is one of the best amp in its class.
I have set about 24.4 mV across the 0.68ohms x 2 (parallel) resistors. I hope this is fine. Now i need to find the PCB of regulated Power supply which can feed both my channels. Can someone guide me to the post number where I can find the PCB for itching with help of toner transfer method.
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