Thanks again for your contributions. I just ran a new test with the A30 working as an integrated amp and I certainly like it better when I put the AR SP 8 on. All sound becomes bigger and more controlled..
AR SP8 mk2 high output volume
Hello everyone, thank you for accepting me in this group. I have my AR SP 8 mk2 preamplifier and I would like to know your opinion and if you consider its high output volume a problem with this power amp. Problem is the volume control is too low, Very sensitive amp. I can't use much volume control.Does this affect the signal quality or is it just a drawback?I just want to know if it's something I need to worry about.
here I put the specifications of the power amp Puresound A30
ower output (Class A operation) 30 Watts/ch Ultra Linear, 18 Watts/ch Triode Coupled
Frequency Response 20Hz - 20kHz -0.25 to -0.3 dB
THD 0,3%
Input Impedance 100 KOhm
S/N ratio 88 dB
Input sensitivity for 0dB 100 mV
Power Consumption 260 Watts
Net Weight 28 Kg
Dimensions (mm) 436 W x 360 D x 190 H
Inputs 3. Line Level
Outputs 4 & 8 Ohm
here I put the specifications of the power amp Puresound A30
ower output (Class A operation) 30 Watts/ch Ultra Linear, 18 Watts/ch Triode Coupled
Frequency Response 20Hz - 20kHz -0.25 to -0.3 dB
THD 0,3%
Input Impedance 100 KOhm
S/N ratio 88 dB
Input sensitivity for 0dB 100 mV
Power Consumption 260 Watts
Net Weight 28 Kg
Dimensions (mm) 436 W x 360 D x 190 H
Inputs 3. Line Level
Outputs 4 & 8 Ohm
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- 50 posts total
@Georgehifi do not see in any review of the A30 R what you comment as a novelty. In fact, now a remote control is incorporated and it is expressly said that it can function as an excellent power amp by raising the potentiometer to the maximumIgehifi New Features (from original A30) ⦁ Twin power transformers for cooler operation and reduced noise floor ⦁ Output transformers have improved laminate material/windings for greater bandwidth ⦁ Remote controlled volume control and mute ⦁ Luxurious high gloss black finish ⦁ Updated styling |
https://ibb.co/J7fFmwm Puresound A30R https://ibb.co/mX2M6CM |
Here is another alternative, leave the A30’s volume up full, or again better still take it and the input selector out, and replace it with a 100kohm resistor to ground. And then get full 6db shaved off the AR preamp’s gain, by a tech to do this. Parallel R39 (another 39kohm) resistor across R29 (also a 39kohm) resistor, this makes it 19.5kohm, more feedback less gain is the result could sound a bit cleaner also. AR output stage circuit diagram. https://ibb.co/Chrcx4t |
AR output stage circuit diagram. https://ibb.co/Chrcx4tOMG- while you are at it, jumper out R-30, C25 and C26. This will allow the feedback to include everything that occurs at the output of the preamp. I would also consider eliminating the C24 bypass cap and replacing C10 with a good quality part of the specified value (bypass caps tend to smear the signal when bypassing a larger coupling cap). D18 really doesn't protect the tube during warmup, but it does affect the sound so removing it is a pretty good idea. ARC left a lot of performance on the table in this design... BTW this preamp is old enough that the power supply filter capacitors should be replaced if you want it to be reliable. If not replaced, the preamp could develop a hum, but could also suffer a power transformer failure and that is an expensive part to replace if you can even find it (ARC does not stock it anymore- they purged older parts like this years ago). |
- 50 posts total