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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 14 Aug 2020, 18:49

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PostPosted: 22 Jul 2020, 20:46 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi Mark, Great, I just looked closely at the paint color...I am building a stereo power amp and the chassis is cranberry. A virtual copy of the color you used. No photo yet and it will be a while to finish as I had to order the transformers.

Good listening
Bruce

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PostPosted: 22 Jul 2020, 21:30 
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Location: Australia
gofar99 wrote:
Hi Mark, Great, I just looked closely at the paint color...I am building a stereo power amp and the chassis is cranberry. A virtual copy of the color you used. No photo yet and it will be a while to finish as I had to order the transformers.

Good listening
Bruce

Looking forward to an image.

Bruce I sent you am PM and an email.

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Projects:“Salt Cellar” - Mono 807 triode integrated amp |
"Rosso" - E88CC SRPP preamp | ”Salt Cellar II” - 6EM7 mono wine box triode amp | “MWH” - 1920s UX-171A preamp |


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PostPosted: 22 Jul 2020, 21:53 
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Hi Mark, Nothing recent, apparently neither made it here. Curious.

Good listening
Bruce

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PostPosted: 22 Jul 2020, 22:04 
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gofar99 wrote:
Hi Mark, Nothing recent, apparently neither made it here. Curious.

Good listening
Bruce

Off thread but maybe I can ask it here. I built the Salt Cellar 807 Triode strapped Mono amp but any Ck on the 807 Rk kept shorting even when I used 100V caps. There is 25V of bias across Rk. I’m using the amp with no Ck and it soundis good but am I missing anything other than more gain and extra harmonics.

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Projects:“Salt Cellar” - Mono 807 triode integrated amp |
"Rosso" - E88CC SRPP preamp | ”Salt Cellar II” - 6EM7 mono wine box triode amp | “MWH” - 1920s UX-171A preamp |


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PostPosted: 22 Jul 2020, 22:29 
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Joined: 06 Apr 2009, 10:08
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mwhouston wrote:
I’m using the amp with no Ck and it sounds good but am I missing anything other than more gain and extra harmonics.
Probably some low end. Here is a comparison I did on the triode strapped 807 prototype with and without a 100µf cathode bypass capacitor.
Attachment:
Screen Shot 2020-07-22 at 8.22.13 PM.png
This is with a 5kΩ load, an 800Ω Rk, and at a B+ of ≈400v. The difference is 5.6dB at 20Hz.

How much you'll hear this is dependent on the frequency content of the music to which you are listening.


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PostPosted: 22 Jul 2020, 22:40 
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Suncalc wrote:
mwhouston wrote:
I’m using the amp with no Ck and it sounds good but am I missing anything other than more gain and extra harmonics.
Probably some low end. Here is a comparison I did on the triode strapped 807 prototype with and without a 100µf cathode bypass capacitor.
Attachment:
Screen Shot 2020-07-22 at 8.22.13 PM.png
This is with a 5kΩ load, an 800Ω Rk, and at a B+ of ≈400v. The difference is 5.6dB at 20Hz.

How much you'll hear this is dependent on the frequency content of the music to which you are listening.

Thanks. I’ll try with a Ck again. Not sure why they keep breaking down.

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Projects:“Salt Cellar” - Mono 807 triode integrated amp |
"Rosso" - E88CC SRPP preamp | ”Salt Cellar II” - 6EM7 mono wine box triode amp | “MWH” - 1920s UX-171A preamp |


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PostPosted: 23 Jul 2020, 00:24 
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I’ve attached Ck - 470uf 63V elcrto and watch B+ and at this point all good. It may have been oscillation before as usually I attach Ck on Rk and never had a problem. This time I had connected it a little more remotely and after 20 seconds it would start to brake down. All good at the mo. If no problems over the next three hours of critical listening I’ll make it permanent directly across Rk.

Thanks for the help. I’m well into another Salt Cellar 6EM7 amp.

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Projects:“Salt Cellar” - Mono 807 triode integrated amp |
"Rosso" - E88CC SRPP preamp | ”Salt Cellar II” - 6EM7 mono wine box triode amp | “MWH” - 1920s UX-171A preamp |


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PostPosted: 23 Jul 2020, 23:42 
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Got it all working good. Maybe a touch more bass but only maybe.

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"Rosso" - E88CC SRPP preamp | ”Salt Cellar II” - 6EM7 mono wine box triode amp | “MWH” - 1920s UX-171A preamp |


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