hifigeek1

Responses from hifigeek1

Replacement meters for Mcintosh MC2125
If the amp is at least 10 years old they are probably not SMD's. However, if you are not well versed in soldering you can easily damage the circuit board traces. I suggest you let a service professional handle that for you. You can also damage the... 
Robin or Rodin Mod of an ARC SP3-A1???
Interesting. The SP-3A1 had a tone defeat switch for the tone controls. It does not however have a tube rectifier in it. I have an SP-3C preamp. The preamp uses a newly designed ARC FET regulated power supply which IMO is vastly superior to the ol... 
By-pass fuse and add a circuit breaker
The other problem with circuit breakers is they can be slow to trip. Generally, when overloaded, fuses will open sooner. 
Replacement meters for Mcintosh MC2125
I would pull the board and replace any electrolytic caps on it. I would also go over all the solder connections looking for cold solder joints. 
help with audio resesrch d76
Well they are different transformers. The CL-60 is triode configured. On the D76, the screen voltage sits at 360Vdc, while the plate voltage sits at 575Vdc. In order for this to be triode configured the screen and plate would have to sit at the sa... 
Replacement meters for Mcintosh MC2125
Are you sure it's the meter and not the drive circuitry to the meters? It seems a bit odd that both meters would have failed. 
Inexpensive Amp for KEF 107s?
Find a used Bryston amp.. 
Music Reference:Design Your Own Preamp youtube vid
Very informative.... 
ayre mx-r versus audio research ref150
Ref150 is an ideal match for 5a's 
Servicing Mcintosh MC2105 amp
There are screws under the amp..You must take the bottom cover off to access them. 
Adding Tone Controls?
I would suggest rather than use tone controls, do some research and make sure you use proper interconnects and speaker wires to tailor the sound you want. Some products are more forgiving than others. 
Audio Research VSi60 integrated reliability?
I would not blame ARC but rather the tube manufactures. Quality is up and down. Since you have the choice of 6550's from Russia or China, I choose Russia. Tubes are not at all like transistors. Once a tube is on, it's going downhill. Some blame al... 
Audio Research VSi60 integrated reliability?
Well KT120's arc just like 6550's do. Possibly a bit less often. With regard to the Chinese 6550's of decades ago. Frankly they were awful tubes. But that was all that was available. They looked like the Tung Sol coke bottle 6550 but that's where ... 
Audio Research VSi60 integrated reliability?
ARC amps do not explode. Occasionally, if an output tube arcs, a resistor might blow which is what it is supposed to do. 
help with audio resesrch d76
If you mean the output configuration the answer is no. I believe the output circuit topology is partially cathode coupled, not triode configured.