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#26 pre amp
#26 pre amp
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Old 11th September 2018, 03:59 PM   #4661
Rod Coleman is offline Rod Coleman  United Kingdom
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#26 pre amp
hello Felipe

For cathode bias, you can use this general diagram to connect the filament (or look at the manuals for my regulator).

Ignore the grid and anode connexions.

For the 26, with about 9V bias For Ia= about 5mA:

R1=1.8K (Welwyn W21 or other vitreous wirewound, o Mills MRA5 or MRA 12 if you can get them).

C1=100F 25-35 or 50V Nichicon VR Panasonic AM or special audio type (to your taste)
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Old 11th September 2018, 04:20 PM   #4662
sumotan is offline sumotan  Indonesia
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Wow C2 MKP 100uf 400v Rod ????
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Old 11th September 2018, 06:06 PM   #4663
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by Rod Coleman View Post
hello Felipe

For cathode bias, you can use this general diagram to connect the filament (or look at the manuals for my regulator).

Ignore the grid and anode connexions.

For the 26, with about 9V bias For Ia= about 5mA:

R1=1.8K (Welwyn W21 or other vitreous wirewound, o Mills MRA5 or MRA 12 if you can get them).

C1=100F 25-35 or 50V Nichicon VR Panasonic AM or special audio type (to your taste)
Many thanks Rod for your kind support, what's the difference in sound quality: less thin/analytic & more warm/body sound?
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Old 21st September 2018, 03:51 PM   #4664
craigtone is offline craigtone  United States
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I posted a populated (by Ale) set of Ale's Gyrator boards in Swap Meet if anyone is interested ...
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