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Starving Student II Headphone Amplifier
Starving Student II Headphone Amplifier
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Old 24th April 2019, 10:09 AM   #71
DualTriode is offline DualTriode  United States
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Quote:
Originally Posted by Hook View Post
Can you use other colors than blue for the LEDs that illuminate the tubes?
I seem to recall that this question was asked once already.

I recall that the LED's are a particular voltage drop used to set bias.

I do not like the artificial glow either. My LED's are going on the other side of the board.

DT
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Old 24th April 2019, 02:50 PM   #72
pmillett is offline pmillett  United States
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Quote:
Originally Posted by Hook View Post
Can you use other colors than blue for the LEDs that illuminate the tubes?
If you use the CCS plate load option (as opposed to the resistor load) you shouldn't change the LED. Not for a different color, or even a different brand/type of blue LED. The forward voltage of the LED sets the reference for the CCS, so changing it will change the plate current. Even within blue LEDs, the forward voltage varies from under 3V to over 4V.

If you use only the resistive load you can do whatever. And of course you can mount the LEDs inside the chassis so they don't show.

Pete
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Old 24th April 2019, 10:21 PM   #73
kpsthakur is offline kpsthakur  India
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Quick check on the Adaptor, can someone please confirm what is the input voltage rating on the one provided in the kit, is it 110V or 230V
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Old 24th April 2019, 10:37 PM   #74
pmillett is offline pmillett  United States
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Originally Posted by kpsthakur View Post
Quick check on the Adaptor, can someone please confirm what is the input voltage rating on the one provided in the kit, is it 110V or 230V
100-240V 50/60Hz is the rating.

Pete
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Old 25th April 2019, 12:42 AM   #75
Hook is offline Hook  United States
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Quote:
Originally Posted by pmillett View Post
If you use the CCS plate load option (as opposed to the resistor load) you shouldn't change the LED. Not for a different color, or even a different brand/type of blue LED. ...

Pete

thanks!

Last edited by Hook; 25th April 2019 at 12:46 AM. Reason: oops
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Old 25th April 2019, 12:45 AM   #76
Hook is offline Hook  United States
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Thanks, I wasn't sure how sensitive the CCS plate load option is, good to know.
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Old 27th April 2019, 02:17 AM   #77
kpsthakur is offline kpsthakur  India
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Quote:
Originally Posted by pmillett View Post
100-240V 50/60Hz is the rating.



Pete
Thank you Pete
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Old 1st May 2019, 07:50 AM   #78
aspringv is offline aspringv  Australia
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Starving Student II Headphone Amplifier
Having just built one, and thinking ahead, what're suitable replacements for the tubes?
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Old 1st May 2019, 09:01 AM   #79
aspringv is offline aspringv  Australia
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Starving Student II Headphone Amplifier
I should clarify - it sounds great with my 'phones.

I'm just thinking about years down the line is all.
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Old 1st May 2019, 04:09 PM   #80
MEPER is offline MEPER  Denmark
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Of the different tubes I have tried the General Electric 18FX6 (made in USA) works best for me. These tubes are the less sensitive for picking up hum from the environment. They also sounds great. I have other brands on the way from ebay to try out. Maybe 18FX6 will be hard to find as NOS......as more and more build this amp....and want to try other tubes and have some spare for the years to come :-)
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