Re: Stereo amplifier

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi,

I guess I should point out I used to design fancy power audio amplifiers 
(very wide DC to 100's of kHz bandwidth) and all that countless moons 
ago...  Almost all of the prototypes and such I had, ended up getting 
destroyed running Tesla coils :o)))  The "load" of a Tesla coil will 
probably tear the guts out of most normal ampli"fires" let alone if you 
also remove the usual 20kHz filters an all.  Unless the amp is worthless 
and you are looking for a way to blow it up, I would not try running a 
Tesla coil with it.  So I guess the answer to the original question is "no"...

IC's like the LM12CLK are probably a better choice since they are tough and 
easy to replace.  You should probably look at toob or SSTC designs long 
before blowing up your stereo amp...

I was somewhat humbled this week in finding I had no more "un-fried" amps 
left in the house and had to buy a new one from Dr. Moog this Tuesday 
;-))  I have zero intentions of hooking it to a Tesla coil ;-))

Cheers,

         Terry


At 10:49 PM 3/6/2003 -0600, you wrote:
>Matt,
>
>To my knowledge almost all solid state audio amplifiers have a low-pass 
>filter on the output limiting the output above 20kHz.  The -3dB point is 
>generally higher, perhaps around 50kHz.  Also, even in "decent" 
>amplifiers, the gain of the amplifier is fairly low at RF 
>frequencies.  Add in some cheap output transistors that have a bandwidth 
>of only a few 100 kHz to a MHz, and you have a recipe for blown fuses or 
>worse - magic smoke.
>
>I suppose you could remove the low-pass filter (parallel RL) and the Zobel 
>Network (shunt RC) on the speaker terminals, but the amplifier would 
>probably start oscillating, leading to increased operating temperature and 
>premature failure.  Some amplifiers also have a low-pass filter on the 
>input which would likely need defeating as well.
>
>As Terry suggested, I wouldn't subject my Denon to the torture.  However, 
>HarmonKardon amplifiers have a "Wide Bandwidth" up to about 100kHz 
>(according to their published specs), and would probably be more tolerant 
>than some other amplifiers.
>
>Good luck!
>
>Mark Broker
>Chief Engineer, The Geek Group
>
>On Thu, 06 Mar 2003 19:51:04 -0700, Tesla list <tesla-at-pupman-dot-com> wrote:
>
>>Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
>><Fucian-at-aol-dot-com>
>>
>>Hey...I was wonderign if the amps for stereo systems could be modefied to 
>>drive a sstc?
>>
>>Matt
>>
>
>
>