6922, et al Burn-in?

ACHiPo · « **Reply #60 on:** 20 Jan 2016, 01:51 pm »

Quote from: E55l2 on 20 Jan 2016, 08:29 am

The curves i published here are for a e88cc, a long life tube (10000 hours) .
To get the maximum life time the manufacturer say this:

btw read also the rest of the datasheet because there are more important things to know about tubes.http://www.mif.pg.gda.pl/homepages/frank/sheets/030/e/E88CC.pdf

The data sheet is what I was looking for, but what I'd really like to see is the 7DJ8 data sheet. I'm assuming the specs and relationships will scale, however, so I now understand better the theoretical impact of running the heater voltage below its spec'd value.

It looks like there are a lot more spec sheets on the site you linked. I didn't come across this when I Googled. We might want to make a link to the main site a sticky?

ACHiPo · « **Reply #61 on:** 20 Jan 2016, 02:01 pm »

I found the 7DJ8 spec sheet. It is equivalent to a PCC88.
7DJ8/PCC88 Data Sheet

The impact of running the heater at 10% below spec doesn't jump out at me, however. I assume it's going to be similar to what E55's posted for the ECC88?

ACHiPo · « **Reply #62 on:** 20 Jan 2016, 02:02 pm »

Here's a link to the data sheet look up site...
Tube Data Sheet Lookup

JakeJ · « **Reply #63 on:** 20 Jan 2016, 02:06 pm »

And another tube data sheet search engine.
http://tdsl.duncanamps.com/tubesearch.php

JakeJ · « **Reply #64 on:** 20 Jan 2016, 02:08 pm »

Oh, and thanks to all for returning this thread to a civil discussion. I hate sending stuff to the IGWB.

ACHiPo · « **Reply #65 on:** 20 Jan 2016, 02:14 pm »

Quote from: JakeJ on 20 Jan 2016, 02:08 pm

Oh, and thanks to all for returning this thread to a civil discussion. I hate sending stuff to the IGWB.

Agreed! But what's the IGWB?

FullRangeMan · « **Reply #66 on:** 20 Jan 2016, 08:22 pm »

Quote from: ACHiPo on 20 Jan 2016, 02:14 pm

Agreed! But what's the IGWB?

http://www.audiocircle.com/index.php?board=111.0

FullRangeMan · « **Reply #67 on:** 20 Jan 2016, 08:24 pm »

Quote from: E55l2 on 20 Jan 2016, 12:11 pm

5% of 6,3V = 0,3V

+/- 5% = between 6,0V and 6,6V

17% lower means 5,2V ( or if you have a 7dj8 7,6V....6,3V )

OK Thanks.

FullRangeMan · « **Reply #68 on:** 20 Jan 2016, 08:32 pm »

Quote from: ACHiPo on 20 Jan 2016, 02:01 pm

I found the 7DJ8 spec sheet. It is equivalent to a PCC88.
7DJ8/PCC88 Data Sheet

This datasheet is from PCC88 an equivalent of 7DJ8.
For 7DJ8 reply are :
Sorry, no matches found.

E55l2 · « **Reply #69 on:** 20 Jan 2016, 09:30 pm »

If you using a 7dj8 at 6,3V it will gave 17% to low voltage.
The curves shows almost 20 % lower performance (S and Ri) only the amplification factor "mu" is almost the same. The curves show also a bit higher distortion.
The circuit design is also importand but i don't have a schematic of your amplifier so i can't help you with this.
Probebly no smoke but what is more important is the life time of your tube and the performance of your amplifier.
If you take the disign serious and the componants inside it too all my "stupid" remarks where not nessecary.

Quote from: ACHiPo on 20 Jan 2016, 02:01 pm

I found the 7DJ8 spec sheet. It is equivalent to a PCC88.
7DJ8/PCC88 Data Sheet

The impact of running the heater at 10% below spec doesn't jump out at me, however. I assume it's going to be similar to what E55's posted for the ECC88?

ACHiPo · « **Reply #70 on:** 21 Jan 2016, 12:22 am »

Quote from: FullRangeMan on 20 Jan 2016, 08:22 pm

http://www.audiocircle.com/index.php?board=111.0

Ahhhh! Gotcha!

Steve · « **Reply #71 on:** 22 Jan 2016, 07:50 pm »

I am not taking sides, just providing one piece of information.

Some manufacturers set the filament voltage to 6.0 volts.

Cheers
Steve

E55l2 · « **Reply #72 on:** 23 Jan 2016, 07:37 am »

If those manufacturers had read the datasheet of the tubes they would have known that that is a stupid action.
Tube life........

Quote from: Steve on 22 Jan 2016, 07:50 pm

I am not taking sides, just providing one piece of information.

Some manufacturers set the filament voltage to 6.0 volts.

Cheers
Steve

FullRangeMan · « **Reply #73 on:** 23 Jan 2016, 09:12 am »

Quote from: E55l2 on 23 Jan 2016, 07:37 am

If those manufacturers had read the datasheet of the tubes they would have known that that is a stupid action.
Tube life........

I think this is much worse then it, they know the harm they are doing, they do it on purpose.

ACHiPo · « **Reply #74 on:** 24 Jan 2016, 12:13 am »

Ok, so my 6922 burn in is solved, now I'm burning in solid state. Quite a nice move up!

My first "NEW" piece of gear in a very long time!

Fancy velvet-ish bag...

Seems to fit in nicely with the rest of the family...

JakeJ · « **Reply #75 on:** 24 Jan 2016, 04:54 am »

Oooo...Purdy! I do like the simple look and lines of Parasound's Halo gear.

Steve · « **Reply #76 on:** 24 Jan 2016, 06:47 pm »

Quote

I am not taking sides, just providing one piece of information.

Some manufacturers set the filament voltage to 6.0 volts.

Cheers
Steve

Response by E55l2.

Quote from: E55l2 on 23 Jan 2016, 07:37 am

If those manufacturers had read the datasheet of the tubes they would have known that that is a stupid action.
Tube life........

Do you mean those who are recommending the 7.6 volt filament be run at 6.3 volts E55??

I am discussing 6.3 volt filament tubes being run at 6.0 volts, which is within +/-5%. I may not have been clear in my last post.

Cheers
Steve

E55l2 · « **Reply #77 on:** 25 Jan 2016, 07:12 am »

Ahhh.
The data sheet say LESS then 5% ! So it is better not to use 6v but a little higher.
But, to be honest, if you use 6V the tube would not die in a very short time i guess.

Quote from: Steve on 24 Jan 2016, 06:47 pm

Response by E55l2.Do you mean those who are recommending the 7.6 volt filament be run at 6.3 volts E55??

I am discussing 6.3 volt filament tubes being run at 6.0 volts, which is within +/-5%. I may not have been clear in my last post.

Cheers
Steve

vonnie123 · « **Reply #78 on:** 25 Jan 2016, 07:30 am »

Those 7DJ8s should work fine. Kevin sells them at a fair price. I used to have an AH njob 4000 tube modded Marantz CD player that used these. You could run 7DJ8, 6DJ8, 6922, or 7308. I now have a Audio Horizons tube buffer which will use any of these above listed tubes interchangeably.

Buying from a trusted source is a crapshoot, unless you have a tube tester to check them. Luckily, I have a good supply and an old TV7 tube tester and can check them when I get new ones, and/ or to check the ones in my systems strength every several hundred hours of use. These guys last a long time. I usually get over a year out of a pair of tubes.

FullRangeMan · « **Reply #79 on:** 25 Jan 2016, 09:16 am »

Quote from: vonnie123 on 25 Jan 2016, 07:30 am

Those 7DJ8s should work fine. Kevin sells them at a fair price. I used to have an AH njob 4000 tube modded Marantz CD player that used these. You could run 7DJ8, 6DJ8, 6922, or 7308. I now have a Audio Horizons tube buffer which will use any of these above listed tubes interchangeably.

Buying from a trusted source is a crapshoot, unless you have a tube tester to check them. Luckily, I have a good supply and an old TV7 tube tester and can check them when I get new ones, and/ or to check the ones in my systems strength every several hundred hours of use. These guys last a long time. I usually get over a year out of a pair of tubes.

Unbelievable!! and you are happy with one sole year of life.
This could be as little as 500 to 1000 hours of use.

CD players are know to put very little stress on tubes.
This CDP have soft start circuit?