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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 10th June 2017, 12:10 AM   #861
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Keantoken,

Thanks. Your right. I need to get my eyes checked.

Brad
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Old 12th June 2017, 01:18 AM   #862
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
On the trimmer resistors should I take measurements from pins 1 and 2, or 2 and 3?

Thanks for the help,
Brad
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Old 12th June 2017, 01:39 AM   #863
keantoken is offline keantoken  United States
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1 and 2.
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Old 3rd August 2017, 06:33 PM   #864
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
I finally put together my second Kuartlotron superbuffer. I had some builder issue on the first buffer that finally got resolved. I triple checked everything on this build before soldering parts in. I did sell the first buffer, but regretted it and had to build this one.

This build used the second version of the PCBs which have the shuntregs. I did not use the on the onboard shuntregs, but instead used two of RJM's S-regs, one for each channel. It was probably over kill, but that's okay. The S-regs are nice boards that fit the bill for this build. I also used a 50K eBay DACT and a 3 position 4 pole Grayhill switch.

The final result is a very nice sounding preamp with great imaging that works very well with my Folsom amp.
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Old 3rd August 2017, 10:01 PM   #865
keantoken is offline keantoken  United States
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Looks nice!
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Old 3rd August 2017, 11:18 PM   #866
Destroyer OS is online now Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Very nice!
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Old 22nd November 2017, 01:08 PM   #867
hkknudsen is offline hkknudsen
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Hi all, I'm planning to buy some lifepo4 batteries for my newly bought Kuartlotron. Any opinion on whether I should go for slightly above the recommended dual 10V, or below? Since they will drift we're maybe talking up to 1V above or below. Thanks for any input
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Old 23rd November 2017, 06:26 AM   #868
acass is offline acass
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Hi, I have a question about switch type and contact material.

I want to build a Kuartlotron with a selector switch in it. 2 in 1 out, what switch, toggle or rotary and what should the contact be, gold, silver or ???.

Thanks in advance, more questions to follow.

Alan.

Last edited by acass; 23rd November 2017 at 06:30 AM.
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Old 24th November 2017, 06:47 AM   #869
keantoken is offline keantoken  United States
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Quote:
Originally Posted by hkknudsen View Post
Hi all, I'm planning to buy some lifepo4 batteries for my newly bought Kuartlotron. Any opinion on whether I should go for slightly above the recommended dual 10V, or below? Since they will drift we're maybe talking up to 1V above or below. Thanks for any input
I would say go slightly above.
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Old 24th November 2017, 06:55 AM   #870
keantoken is offline keantoken  United States
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Quote:
Originally Posted by acass View Post
Hi, I have a question about switch type and contact material.

I want to build a Kuartlotron with a selector switch in it. 2 in 1 out, what switch, toggle or rotary and what should the contact be, gold, silver or ???.

Thanks in advance, more questions to follow.

Alan.
I suggest a 3-pole switch so you can switch ground along with R and L, therefore keeping the source grounds separate. Other than that, I have no experience with what switches work best. However I think any switch that is not known for problems will get you 99% of the way there.
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