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ieales

Responses from ieales

Dedicated power
You don’t want the AC line mains voltage bouncing around in beat with the music when pushing the amp hard. An amplifier’s power supply like/needs the AC line voltage steady state. The power line does not bounce around in tempo with the music. The... 
Critical subwoofer tip
I have a question for people who have phase controls for their subs. How do these work? see ieLogical SubterraneanHomesickBlues Most Phase controls are All Pass filters. They don't affect all frequencies equally. see http://www.ielogical.com... 
Best temperature for optimum tube performance
For not lowering my standards enough, I do apologize. Will try to do better, by which I mean worse, going forward.   Not possible 
Dedicated power
What most of you big gauge gurus fail to realize is that musical transients are asynchronous to the power line frequency. Low E on a bass is 41.2 Hz. The lowest common multiple with 60Hz is 6180 or every 103 line periods for bipolar supplies and e... 
Dedicated power
We use conduit hard pipe (emt) in Chicago. Romex has better rejection than loose wires in EMT.Twisted L-N in conduit it best, but it's a bitch to pull.See pp 31ff here  Microsoft PowerPoint - Indy AES 2012 Seminar w-Notes v1-0.ppt (wordpress.c... 
Dedicated power
Mr Carbon is a president of TAMC [Tweak A Minute Club] Headroom loss for 14ga vs 10ga is less than ¼db @ ≈14A / ≈1600W See  ieLogical CableSnakeOil AC WiringMusic power is a fraction of that. Head banger rock @ 120BPM uses about 2 cycles peak e... 
Best temperature for optimum tube performance
It takes very little air flow to cool a chassis significantly. I've been doing it since the 70's. A couple of 12v 60mm PC cooler fans running on 3.5v are completely silent and cool the internal chassis from 50°C to 30°C on my tweeter PrimaLuna PL-... 
Two subwoofers for two channel music listening
^^^ REL recs are nonsense. Subs are 100% room and main dependent. Right. No difference. Sub bass is mono. Line level or speaker level, same result. Running from one to he next is fine too. I've done all three. No difference. Use whichever is most... 
Red Plating??
A CV or Isolation Transform is a 1:1 device. It does not reduce the input voltage unless running above rated current. For proper operation, the load must match the device capacity.It provides isolation and reduces some noise components, some by a ... 
Red Plating??
chinook9, log your voltage over a few days. It is not uncommon to have a higher level for short periods. Base your required drop percentage on average. Note that voltage levels can vary drastically by season dependent on the local requirements. In... 
Red Plating??
A bucking transformer is one day project. Built as I did, it covers from <115 to 126 voltsChanging bias will INCREASE B+ as current will drop.A variac is a simple solution, but one I don’t recommend. 
Red Plating??
Given the ambient light level, it is a fair bit more red-plating than a little.IF you are competent to operate inside a tube amplifier, check rated voltage, B+ and the cathode resistors. !!!__ ALWAYS KEEP ONE HAND IN YOUR POCKET __!!!Many US HiFi ... 
Living with unsolvable hum - Any audio detectives out there?
As good as Jensens are, any transformer will introduce sonic artifacts which vary with the equipment either side of them. 
Living with unsolvable hum - Any audio detectives out there?
It's a no brainer that 60Hz hum is likely a ground loop.A Loop Break in the amps from Earthing (Grounding) Your Hi-Fi - Tricks and Techniques (sound-au.com) may solve the issue and keep the system safe.!!_DO NOT RUN THE SYSTEM WITH THE SAFEY EARTH... 
Living with unsolvable hum - Any audio detectives out there?
Does one connected power amp only hum? i.e. completely remove one amp from the system.Try each amp. One amp may be quieter than the other.If no hum with only one amp, try reversing power transformer input leads on the other power amp. I had a simi...