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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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PostPosted: 20 Apr 2018, 18:21 
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Joined: 04 Jun 2008, 20:59
Posts: 4032
Location: Arizona, USA
Hi, It should be OK. The biggest problem with long traces is in the signal area. Ones for heaters and B+ are only problems when they are near signal ones.

Good listening
Bruce

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PostPosted: 24 Apr 2018, 08:23 
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Joined: 01 Apr 2017, 19:56
Posts: 49
metaldog99 wrote:
Very nice build.

I am considering doing PCB's for my build, and have some questions on your build:

1. Which schematic version did you use for your build?
2. Where did you source the chassis with vented lid?

Info appreciated.

Phil


Hi There. Sorry for the late answer.

1) I have used the latest schematics (2017) and developed the board on Kicad.
I agree with Bruce. Don't order a bunch of PCBs. I have went though at least 4 board mods until I was satisfied.

2) The cabinet was handmade using 1/8" thick aluminum sheet.


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PostPosted: 24 Apr 2018, 10:01 
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Joined: 14 Jul 2014, 13:18
Posts: 38
Location: Arizona
Thanks for the information.

I am still debating on whether to go PCB or point-to-point. Single board PCB runs are a bit pricey if I factor in several revisions required.

Did you source your PCB's online? The cheapest I've found is PCBway. I've also looked at Bay Area Circuits as an option.

Thanks again,

Phil

victorzwk wrote:
metaldog99 wrote:
Very nice build.

I am considering doing PCB's for my build, and have some questions on your build:

1. Which schematic version did you use for your build?
2. Where did you source the chassis with vented lid?

Info appreciated.

Phil


Hi There. Sorry for the late answer.

1) I have used the latest schematics (2017) and developed the board on Kicad.
I agree with Bruce. Don't order a bunch of PCBs. I have went though at least 4 board mods until I was satisfied.

2) The cabinet was handmade using 1/8" thick aluminum sheet.


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PostPosted: 24 Apr 2018, 12:35 
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Joined: 14 Jul 2014, 13:18
Posts: 38
Location: Arizona
What should the minimum voltage ratings be for the capacitors that connect to the LT1085 ports? (circled in red)

My assumption was 16V - 25V is ok for all except the 4.7uF paralleled with the 100K which should be 250V.


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Capture.PNG


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PostPosted: 24 Apr 2018, 13:52 
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Joined: 02 Mar 2009, 12:41
Posts: 1110
Location: Vänersborg, Sweden
The general rule of thumb is that the applied voltage on an electrolytic should'nt be more than 85-90% of the cap's rated value.

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PostPosted: 24 Apr 2018, 15:59 
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Location: Arizona, USA
Hi, I use 25 volt ones there except the one off the B+ and there I use 250 volts. Electrolytics are funny things.....you certainly don't want to go over the ratings, but you don't want to get ones that are really excessively rated higher. Unless they are non-polar some voltage is need to make them work properly. Another factor is cost. A 10,000uf 500 volt cap is both huge and expensive.

Good listening
Bruce

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PostPosted: 24 Apr 2018, 16:47 
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Joined: 14 Jul 2014, 13:18
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Location: Arizona
Thanks for the advice - all help is welcome.


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PostPosted: 24 Apr 2018, 20:20 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi, just out of curiosity...I see you are in Arizona. Mind if I ask where?

Good listening
Bruce

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PostPosted: 24 Apr 2018, 20:49 
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Joined: 23 Feb 2017, 02:02
Posts: 553
metaldog99 wrote:
What should the minimum voltage ratings be for the capacitors that connect to the LT1085 ports? (circled in red)

My assumption was 16V - 25V is ok for all except the 4.7uF paralleled with the 100K which should be 250V.


Attachment:
Capture.PNG


The caps at the output and middle pin of 1085 will never see more than 5v unless the 1085breaks down
so anything at 10v or higher are relaiable and 100% safe

The input regulator caps will see the rectified voltage feed into the 1085 which is not much. 25v is good.
Its 100% same as the heaters are disconnected from 68v bias

The 68v bias brings the cathode and heater voltage diffrential down to help reduce noise in valves, also vlaves have max heater to cathode voltage before breakdown, which is typically 150v or higher

the 47uf at the two ends of regulted 5v output grounds heater noise to reduce noise in amp. any noise at heaters tend to go into amp. cap is like short in ac(sound) but not dc


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PostPosted: 25 Apr 2018, 02:24 
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Joined: 14 Jul 2014, 13:18
Posts: 38
Location: Arizona
KochiyaYamato wrote:
metaldog99 wrote:
What should the minimum voltage ratings be for the capacitors that connect to the LT1085 ports? (circled in red)

My assumption was 16V - 25V is ok for all except the 4.7uF paralleled with the 100K which should be 250V.


Attachment:
Capture.PNG


The caps at the output and middle pin of 1085 will never see more than 5v unless the 1085breaks down
so anything at 10v or higher are relaiable and 100% safe

The input regulator caps will see the rectified voltage feed into the 1085 which is not much. 25v is good.
Its 100% same as the heaters are disconnected from 68v bias

The 68v bias brings the cathode and heater voltage diffrential down to help reduce noise in valves, also vlaves have max heater to cathode voltage before breakdown, which is typically 150v or higher

the 47uf at the two ends of regulted 5v output grounds heater noise to reduce noise in amp. any noise at heaters tend to go into amp. cap is like short in ac(sound) but not dc


Thanks so much for the explanations. They make sense and help with overall understanding of the circuit elements.


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