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xrk971 Pocket Class A Headamp GB
xrk971 Pocket Class A Headamp GB
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Old Yesterday, 12:24 PM   #1361
xrk971 is offline xrk971  United States
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xrk971 Pocket Class A Headamp GB
Nice case DrPro! I like your linear regulator - sounds dead quiet and no hum right?
Click the image to open in full size.

Are you running PSU power through PCB pot switch or linear PSU stays on as long as plugged in?
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Old Yesterday, 02:09 PM   #1362
drpro is offline drpro  United States
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Yes the regulator is on as long as the switched power supply is plugged in. Forgot that little detail, probably should add a power switch. Yes to the silence, went with your suggestion way back in post 1037. Ebay for the regulator was about 20usd, had the Apex Jr. 15000uf caps, plus most of the other items in the parts bins.
I have been letting it cook for the past day. So far I think it is a bit better sounding than the battery version.
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Old Yesterday, 03:18 PM   #1363
xrk971 is offline xrk971  United States
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Awesome to hear I sounds great. The battery version is already superb. In my other thread I am seeing measurable differences in carbon film vs metal film resistors for crictial audio path like feedback loop resistor. Although this is feedbackless amp, the main source power resistors might benefit from change to carbon. Less third harmonic generation.

AKSA's Lender Preamp with 40Vpp Output
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Old Yesterday, 08:57 PM   #1364
xrk971 is offline xrk971  United States
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xrk971 Pocket Class A Headamp GB
I just built up another one and trying out the Nichicon KA 2200uF 16v for output cap. It fits perfectly! Now this is the ultimate deep bass pocket amp. I am bypassing with 10uF Elna Silmic II on the SMT side. It measures nicely too, here is 1.00vpp into 270ohms - giving 0.027%THD and dominant second order.

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