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OK to leave the amp on STAND-BY for long hours?

Posted: Sat Mar 23, 2019 7:31 pm
by amt7565
Anyone know what the manufacturer's recommendation is on leaving the amp on Stand-by mode for long hours?

During the weekends, I like to leave it on stand-by the entire day, so that I can play often w/o having to switch it on and off too many times. I also suppose that switching on/off also deteriorates the tubes with time.

thanks for any feedback.
Happy Weekend.

Re: OK to leave the amp on STAND-BY for long hours?

Posted: Sat Mar 23, 2019 11:43 pm
by Greg_L
amt7565 wrote:
Sat Mar 23, 2019 7:31 pm
Anyone know what the manufacturer's recommendation is on leaving the amp on Stand-by mode for long hours?

During the weekends, I like to leave it on stand-by the entire day, so that I can play often w/o having to switch it on and off too many times. I also suppose that switching on/off also deteriorates the tubes with time.

thanks for any feedback.
Happy Weekend.
Standby all day might be worse than just turning it on and off.

Some argue that the cathodes "cook" when they're just sitting there doing nothing. They're being heated for no reason. Standby is more a convenience than a necessity. No amp needs a standby. Amps will work just fine with nothing but an on/off switch.

Re: OK to leave the amp on STAND-BY for long hours?

Posted: Sun Mar 24, 2019 2:08 am
by amt7565
Thanks for the insight Greg.

Re: OK to leave the amp on STAND-BY for long hours?

Posted: Sun Mar 24, 2019 10:16 am
by chronos1701
On the other hand, constant heating and cooling can result in thermal fatigue which may result in failure of the metal component in the tubes. If you're leaving the amp alone for several hours at a time, I would turn the amp off. If you're only away for 15 minutes, I would leave the amp in standby. It really depends on how you plan to use the amp. But that's just me.

Re: OK to leave the amp on STAND-BY for long hours?

Posted: Sun Mar 24, 2019 3:25 pm
by DalyCro
I am not using it at all. Many time when I start to play, something or someone distract me and then I had to leave for a while. I put amp into standby because I always think I will be back soon. Unfortunately a lot of times amp stays on standby for hours and hours.
Result was....two times in one year I had to change power tubes. Reason was what Greg told you. I google it and found out that standby switch is not needed component in amps.

For last 1.5 years I still let amp on for hours while not playing but I am not putting amp into standby mode. Amp works just fine.
I am not even using standby switch when turning amp on or off. On my 205 standby switch is nothing but cosmetics :).

There is a theory that support why standby switches causing more problems than good. Google is your friend.

Rock on.
DD

Re: OK to leave the amp on STAND-BY for long hours?

Posted: Tue Jul 02, 2019 4:28 am
by Hot 'Lanta Cat
It's good practice to use the standby when first powering up the amp,[says so in the manual] let the power tubes warm up then rock out.
Leaving it on for hours when not using it is nuts.
It's not like a modern standby mode in your TV or Home Theater gear.
Where all that is powered is a LED lamp.
You are taking years off the power tube's life.
Shut it off.

Re: OK to leave the amp on STAND-BY for long hours?

Posted: Tue Jul 02, 2019 7:14 am
by erpece
Hot 'Lanta Cat wrote:
Tue Jul 02, 2019 4:28 am
It's good practice to use the standby when first powering up the amp,[says so in the manual] let the power tubes warm up then rock out.
Leaving it on for hours when not using it is nuts.
It's not like a modern standby mode in your TV or Home Theater gear.
Where all that is powered is a LED lamp.
You are taking years off the power tube's life.
Shut it off.
Still, I wonder... I'm an old fart and I remember all these vacuum tube tv's and radio's of the day... None of them had a stand-by switch and they seemed to work just fine for decades.

Re: OK to leave the amp on STAND-BY for long hours?

Posted: Tue Jul 02, 2019 11:44 am
by Greg_L
erpece wrote:
Tue Jul 02, 2019 7:14 am
Still, I wonder... I'm an old fart and I remember all these vacuum tube tv's and radio's of the day... None of them had a stand-by switch and they seemed to work just fine for decades.
Right. How many amps from the 50s and 60s still work with just an on-off switch? A bunch. Many of them have an on-off switch and volume pot all in one.

And what does standby even really do? I think in most amps it cuts off the HT voltage and allows only the heaters to work. Maybe there's a minuscule advantage towards tube life in amps with really high plate voltages. Standby allows the cathodes to be warm before the tube gets bombarded with high voltage. It's debatable whether that matters or not because cooking cathodes without the plates being energized can shorten tube life too.

Re: OK to leave the amp on STAND-BY for long hours?

Posted: Tue Jul 02, 2019 3:20 pm
by okgb
They made better tubes back then, the phrase is cathode striping where the tube is hit with full voltage instantly, deteriorates a bit. Like a light bulb popping when you turn it on, some .....people leave tube gear on 247 , mesa had recommended leaving amps on standby in between sets but I think most people would turn it off over night, so I think it's a question of how long, it's the initial turn on that that causes damage, on and off of standby is
still having the amp on cooking !

Re: OK to leave the amp on STAND-BY for long hours?

Posted: Wed Jul 10, 2019 1:09 am
by okgb
I thought that cathode stripping was a real thing , perhaps not with good caps ?
interesting article here [ any science ? ]
https://www.sweetwater.com/sweetcare/ar ... itch-myth/