[HAM] DC filtering to the heater filament voltage of the AO28

[David Anderson]

Scott,

I agree. Like I said, I ran the calculations on it once, but I never  
got sufficiently interested in it to try it.

Usually, a DC heater supply needs to be designed as such from the get- 
go.

On a different note, I do think it is possible to improve the overall  
grounding schemes in both organs and Leslies. There have been some  
advancements in grounding/shielding know-how over the last 50 years.  
Of course, as you say, we're talking about small gains that appeal to  
us Hi-Fi nuts whose heads would explode if we didn't have something  
towards which to direct our obsessive-compulsive energies.

Luckily for me, I just got all my parts to build my new tube line- 
stage preamp. OCD heaven.

David A.

On Dec 21, 2007, at 10:37 AM, Scott Hawthorn wrote:


> I confess to being puzzled by this whole discussion. It's just that  
> I have
> never known hum to be a problem with AO-28 amps, unless the amp is  
> broken.
> Of course it has been famously said that these organs are not HI-FI
> equipment. I guess if somebody wants to phool around with it, then  
> that's a
> fascinating hobby, but really, the bottom line is that it's  
> pointless, IMHO.