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post #3691 of 3699

Man am I confused.  The first bit of confusion is the notion that it is the transformer , which continues to provide power making low level music via residual power from the transformer after the amp is turned off.  I am not an EE or even an ee or e, but I thought that power came from the electrolytic capacitors. 

After reading the strongly worded cautionary statement regarding about not  leaving headphones attached,.  However my personal history seems to  contradict this thinking . I have never experienced nasties between HP and the plate of the power tube in an OTL design.

What kind of damage occurs?  I have should have been destroying my headphones for years, yet they sound pretty good to me barring normal wear. My current HP system construct is a SinglePower Extreme (an OTL) and either Sennheiser HD 700s  the AKG KXX.  There is the occasional fairly rare guest appearance by the Beyer DT 770 Pro 32 Ohm. 

Oddly I have never heard or read of  HP immolations or pyrotechnics.  Yet  I  know I will of course unplug my HPs. I have as bad a case of audiophilitis nervosa as the next guy!

Seriously is there an idiots guide to a basic understanding    home  electronics  for home and perhaps (only if absolutely neccesarry} pro audio..

.

post #3692 of 3699

Just to chime in, I have a La Figaro 339 OTL amp, and I have always turned the amp on/off with headphones unplugged. Never had issues with arcs that way.

Also re: pinging sounds, the glass of a tube expands when warming up and makes ping sounds. Some 'lesser' quality tubes will warm up for a minute or two (svetlana UFO 6AS7G), while tubes with thicker glass (Bendix 6080WB) will make pinging noises for 20+ minutes until the glass has fully expanded.

post #3693 of 3699

Like many things in life, many have never had a problem leaving their headphones plugged in while turning their OTL on and off. However, I personally know of two people who have. In each case, they powered up their OTL, a power tube shorted and the current surge took out their headphones.

 

Powering up and powering down is stressful on vacuum tubes and these are the times when they most often fail, sometimes catastrophically. And of course, you never know in advance. So I always advise caution. The best practice is to be unplugged when turning on and off. Be careful out there....

 

Cheers

post #3694 of 3699

I like the sound of tubes warming up :) Then again, I mainly listen to vinyl when using my headphone amp and don't mind the odd crackle at the beginning of an LP or inbetween tracks. 

post #3695 of 3699
Quote:
Originally Posted by adeadcrab View Post
 

Just to chime in, I have a La Figaro 339 OTL amp, and I have always turned the amp on/off with headphones unplugged. Never had issues with arcs that way.

Also re: pinging sounds, the glass of a tube expands when warming up and makes ping sounds. Some 'lesser' quality tubes will warm up for a minute or two (svetlana UFO 6AS7G), while tubes with thicker glass (Bendix 6080WB) will make pinging noises for 20+ minutes until the glass has fully expanded.


Does the Bendix 6080WB go by any other name.  I ask because Bendix had purpose built tubes for fairly specific applications (read  as  'uses' which is what the word meant before smart phones)  I would like to buy a pair and would appreciate any help finding dealers who sell them.

 

Somewhere in the bottom of a box I own some Bendix tubes that I was told were super EL-84s.  They are remarkable tubes construction wise.  These tubes have very  thick ceramic spacers and the thick glass as noted.  The problem is they have a different pin out and resemble 6AQ5s electrically. They were a throw in freebee so no financial loss.

post #3696 of 3699
Quote:
Originally Posted by Mechans1 View Post
 


Does the Bendix 6080WB go by any other name. 

The 6080WB tubes I have are rebranded as Tung Sol.

I have actually dropped one (!!) accidentally from standing height and it is still ok: rock solid construction..

post #3697 of 3699
Quote:
Originally Posted by Mechans1 View Post
 

Man am I confused.  The first bit of confusion is the notion that it is the transformer , which continues to provide power making low level music via residual power from the transformer after the amp is turned off.  I am not an EE or even an ee or e, but I thought that power came from the electrolytic capacitors. 

After reading the strongly worded cautionary statement regarding about not  leaving headphones attached,.  However my personal history seems to  contradict this thinking . I have never experienced nasties between HP and the plate of the power tube in an OTL design.

What kind of damage occurs?  I have should have been destroying my headphones for years, yet they sound pretty good to me barring normal wear. My current HP system construct is a SinglePower Extreme (an OTL) and either Sennheiser HD 700s  the AKG KXX.  There is the occasional fairly rare guest appearance by the Beyer DT 770 Pro 32 Ohm. 

Oddly I have never heard or read of  HP immolations or pyrotechnics.  Yet  I  know I will of course unplug my HPs. I have as bad a case of audiophilitis nervosa as the next guy!

Seriously is there an idiots guide to a basic understanding    home  electronics  for home and perhaps (only if absolutely neccesarry} pro audio..

.

 

Long ago, I experienced 5998's arcing over on one one of my SP Extremes but I was very lucky and no damage occurred.

Others using different amps have not been lucky and the HP driver was blown.

 

Warm up noises have not been a problem for me.

post #3698 of 3699
Quote:
Originally Posted by rosgr63 View Post
 
Quote:
Originally Posted by Mechans1 View Post
 

Man am I confused.  The first bit of confusion is the notion that it is the transformer , which continues to provide power making low level music via residual power from the transformer after the amp is turned off.  I am not an EE or even an ee or e, but I thought that power came from the electrolytic capacitors. 

After reading the strongly worded cautionary statement regarding about not  leaving headphones attached,.  However my personal history seems to  contradict this thinking . I have never experienced nasties between HP and the plate of the power tube in an OTL design.

What kind of damage occurs?  I have should have been destroying my headphones for years, yet they sound pretty good to me barring normal wear. My current HP system construct is a SinglePower Extreme (an OTL) and either Sennheiser HD 700s  the AKG KXX.  There is the occasional fairly rare guest appearance by the Beyer DT 770 Pro 32 Ohm. 

Oddly I have never heard or read of  HP immolations or pyrotechnics.  Yet  I  know I will of course unplug my HPs. I have as bad a case of audiophilitis nervosa as the next guy!

Seriously is there an idiots guide to a basic understanding    home  electronics  for home and perhaps (only if absolutely neccesarry} pro audio..

.

 

Long ago, I experienced 5998's arcing over on one one of my SP Extremes but I was very lucky and no damage occurred.

Others using different amps have not been lucky and the HP driver was blown.

 

Warm up noises have not been a problem for me.

Glenn warned me about this could happen.....this is why I always have headphones unplugged for a few minutes for my tubes to warm up....and always unplug before shutting down...also believe this is what Glenn recommended to me.

 

I run the 5998 & the C3gs often in my amp.....my amp has the 5998 switch and runs C3g natively, without adapters, I make sure I have my 5998 switch in position before powering up my amp.....it is definitely one of my favorite combos....even with the Grado RS1

 

 

Listening to some Buddy Guy right now....wonderful.


Edited by whirlwind - 7/12/16 at 7:38am
post #3699 of 3699

Nice photo, great amp.

 

Better safe than sorry.

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