TUBE BIAS, socket to me!


BIAS: (I'm starting from zero understanding) 

I have never measured/adjusted bias in the 3 tube amps, 3 tube receivers, and 2 tube preamps I have acquired over 47 years. I just switched my current Cayin from 6550's to KT88's. Adjust bias? Adjusters inside, scary electrocution warnings. I could pay someone else to do it, i.e. Steve at VAS 1 hr away in NJ, soooo, 

What really counts? (personally I don't care about either heat or life, but would like to understand)

Heat?
Life?
Output stays Matched when adjusted?
Acoustic Performance?
_________?

Over the years, fronts off, bottoms off, I hose em down with contact cleaner/lubricant, compressed air, all controls and switchers, any adjusters, swish full spin back and forth. Kill any spiders, look for, replace the rare burnt resistor. 
Then leave any adjusters (whatever they are) in the middle position, button it back up.

Two tube testers, my big hickock always agrees with small portable one, test strength, shorts, matched strength old and newly purchased. Large collection of NOS, used. Often used test essentially same strength as new ones.

When they go, it's usually a short.
elliottbnewcombjr
@sokogear

You are defending SS, great. You ought to start a new thread about 'tubes are too fussy ...'.

I and many others prefer tube sound quality, I find tubes more involving. After many years, I sum it up as simply this: analog gets both the fundamentals and overtones 'right'. If you want to know what other people love about tubes, it ain't words, go listen. Many have listened, heard differences, and prefer SS. Many love inefficient speakers and need SS to get enough power.

That's it, except, you have implied I shouldn't consider myself an audiophile, because I am not fussy enough to achieve audiophile sound quality. 

I have achieved, with fun not fuss, over many years, excellent sound quality. Primarily from Vintage gear. I believe, if you came here you would love the sound of my system. I've had excellent SS gear here.

Let's be clear, fussy people enjoy being fussy, it's part of their enjoyment.

Yes tubes are more fussy than SS. I am trying to tell you, if you hear and want tubes, don't fear, tubes don't need to be too fussy.

And, if you are tempted by tubes after hearing them, I believe any person with tube gear: owning a simple tube tester is part of having confidence with tubes. 

If you leave your SS on all the time, IMO you 'drank the koolaid'.

Tubes need break in when new, say 60 hours, after that, me: on just a few minutes before use.

I don't spray tubes, I spray the controls, moving parts with electrical contacts within vintage equipment using contact cleaner and lubricant. That's inherent with vintage equipment, not fussy, regular maintenance. SS doesn't need maintenance? I had to clean the controls of my McIntosh SS Preamp and SS Amp. Newer stuff, perhaps not.

Take great vintage stuff apart, see the thin wires, the 'good enough' parts, nowhere near the current 'audiophile' quality parts, yet those wires and parts is what made that company's reputation.

I'm not criticizing others, but for myself: What I hear: the difference between speakers, between the interaction of the space with those speakers. And excellent engineering of source material. Better TT (up to a point), cartridges.

I hear the difference between formats, LP and Tape, higher noise specs, surprising to many, always besting CD here, and Tubes always preferred to SS when compared here. 

Other than that, I'd rather buy more music than chase minute improvements, fussy improvements if you will.

I have a dedicated circuit for my preamp and amp. Everything else, CD, R2R, Cassette, 8 Track my Chase unit on a regular household circuit. Only one source device is on at a time.

NO: power conditioners, monster power cords, super fuses, directional interconnects, pure silver ... contact fluid on rca jacks, source equipment with external power supplies, weights on my cd player, bejeweled speaker cables, or trusses off the floor. 

Just 'good enough' quality equipment, via tubes to with very revealing  speakers luckily in a listening space great for them. 

I have a good friend with all of the above. He loves my system. We have brought much of his stuff over here, bit by bit, he has to admit, we don't hear a difference. I watch him search for 'better' for many years, frankly he needs a better space, and his speakers are terrific but too narrow dispersion and lack bass. Fixed on spikes (that I gave him), terrific imaging only for center spot. Minimum controls, minimum interconnects, no tone controls, ....

Once, only once that I remember, way back when, a group of golden eared reviewers finally agreed to a blind listening test. Between a Pioneer Receiver and high end separates, the 'best' of the day. Statistically, the answers were random, no discernable difference could be identified.

Once I got an interesting woofer at a garage sale, holes and tears in the cone. Just for fun I slapped some scotch tape on it, it sounded surprisingly good. Finally learned Einstein's theory of relativity.


You may have learned A theory of relativity, but it has nothing to do with Einstein's Theory.
@elliottbnewcombjr- I’m not defending SS- its all I’ve ever used. The stereo dealer I trust most told me it depends on the amp more than the technology. Tubes tend to cost a bit more for a given SQ. As I said, my only experience was listening to tubes when the room heated up significantly. Just like belt vs. direct drive TTS - it depends on the table.

I think you are fussy, and an audiophile. My wife and kids think I’m nuts, but I think I am practical and believe in the law of diminishing returns. I’m not an upgraditis guy spending 10’s of thousands on a whim for the latest and greatest. I didn’t get a record cleaning machine because my records are in perfect shape (mostly) and when a dealer had me bring some records in and compare the sound before and after cleaning, I couldn’t hear a difference. I don’t buy old used records unless they are NM or unopened.

Since I leave my amp on all the time I’ve drank  the kool-aid? What does that mean?

I do use a power conditioner- things have to be plugged in somewhere, right? Got a good Furman one used for $300. No dedicated circuits, but I don’t think there are any things being used on the circuit except my amp, phono stage, turntable, tv, and cable box.

I recently vastly improved my turntable by first putting an isolation platform under it. I was convinced by a frequent AG contributor (MC) who swore by it. I was very skeptical about that tweak, but it made a dramatic improvement, like a new turntable - more detail, depth, bass, and to remove foot faults because of my suspended floor over a crawl space put a wall shelf in for my turntable. Of course foot faults went away and the sound improvement was subtle if anything. 
My one interconnect was $200, power cords were all about $100, and my speaker cables were about $500.

No other tweaks other than Herbie’s tenderfeet under my amp and phono stage ($100 total). That was a more theoretical improvement purchase as keeping wires perfectly still does improve the sound, but the question is, can you hear it? Probably not.
My speaker sensitivity is 88dB, so maybe I shouldn’t consider tubes. MC says not to buy speakers under 92dB. I think he goes overboard sometimes.

You hit the nail on the head though, so much is dictated by the room. 
I am thinking that if I follow my rule of not doing any component upgrade unless it is a NOTICEABLE improvement and under $1K net after trade, so I’ll probably stick with my Pliniuis.

i don’t know how old you are, but I think some people who grew up with tubes prefer them. I grew up with vinyl, built a nice collection and tried CDs and didn’t think they even came close to records.
Einstein's Theory of Audio Relativity:
Sound quality equals double blind BS times the vintage age squared.