[HAM] 21H Leslie

[David Anderson]

I got a matched quad of the new Russian reissue of the Tung Sol 5881  
for my Leslie 32H.

New Sensor did a very good job of copying the Tung Sol originals with  
this one. All 32H amps I've seen with original tubes had Tung Sols.

Distortion could be caused by a lot of factors including a weak 6SN7.

ALL old paper capacitors in an amp this old SHOULD BE REPLACED!!!

I've had good luck doing total rebuilds on 21H and 32H amps. A few  
improvements in the wiring, especially the ground wiring, can make  
them quieter at idle, which is not to say it's really a problem  
stock. Tying all your wiring in little bundles looks neat, but isn't  
the best for preventing the signal wires from picking up heater  
filament supply hum.... I also like using a 4-section power supply  
capacitor and filtering the output tube screen/field coil supply with  
the extra 30uF section.

Also, check the condition of the all contacts/plugs/sockets between  
the amp and the speakers. I found corrosion on the treble driver  
crossover socket of one 21H bad enough to put a few ohms of  
resistance in series with the horn.

David

On Dec 19, 2007, at 9:27 AM, Ricky Leonard wrote:

> I just bought a 21H Leslie that has the 32H series 3 amp in it.
> I have some questions about it if anyone can help.
>
> *The tube chart calls for four, 5881 tubes. It has two 5881's and  
> two 6L6's. It does say that 6L6's can be substituted for the 5881's.
> Is it OK to have them mixed or, would it be best if they were all  
> the same?
>
> *The Leslie seems to break up/distort a lot quicker than my 122. Is  
> that characteristic of a 21H? Could it be that it just needs new  
> tubes or an amp rebuild.
>
> *Who sells the motor controllers to get the slow speed and how much  
> trouble are they to put on?
>
> Thanks,
>     Ricky