Bottlehead Forum
Bottlehead Kits => Stereomour II => Topic started by: Samsquatch on April 23, 2020, 07:58:44 AM
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Hi Bottlehead Forum.
I have just begun my Stereomour II build and am just wondering if there is any benefit from upgrading the 10 Ohm pots and the 4 pole 3 position switch. And if so what would the recommendations be?
Thanks in advance!
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The 10 ohm pot is a hum pot (the Stereomour is an auto biasing amp). There are very, very few choices available that would work well in that position, so I wouldn't recommend changing out that part.
Some folks have changed out the 4P3T switch for a Goldpoint.
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Thanks Paul.
So would the hum pots become obsolete with the DC filament upgrade?
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The DC filament upgrade does not create, ripple free DC, so the humpot is still quite useful.
The 2A3 filament itself is a 1 ohm resistance that sits across the hum pot and 22 ohm balancing resistors, so this isn't a mission critical part. With the DC filament upgrade, there are also some big caps in parallel with the 2A3 filament that are even lower impedance than 1 ohm (at most frequencies).