Quickie chassis

corndog71 said:
Hold the phone!  Has this been discussed before?  I must've missed it.  2 D batteries in series will last longer?  Does this call for any other changes?...
I don't recommend it, especially at the stock 36v B+. The upper half of the filament is essentially cut off, giving increased output impedance and reduced linearity. To double the life, put two D cells in parallel as PB suggests.

[edited to say PARALLEL - oops!]

There used to be larger industrial NiCd cells (larger than D cells) - I don't know if they still exist, or (most important) if they are available with the recent long-shelf-life feature. But the 1.2 volts of a NiCd is maintained through the discharge and should be close to ideal for a Quickie.
 
Paul Joppa said:
I don't recommend it, especially at the stock 36v B+. The upper half of the filament is essentially cut off, giving increased output impedance and reduced linearity. To double the life, put two D cells in series as PB suggests.

There used to be larger industrial NiCd cells (larger than D cells) - I don't know if they still exist, or (most important) if they are available with the recent long-shelf-life feature. But the 1.2 volts of a NiCd is maintained through the discharge and should be close to ideal for a Quickie.

The possibility would come along with biasing the center of the filament.
 
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