Pro Audio PA Amps - Bargains to Be Had?

Do you mean non-switching as in power supplies or as in A/B sliding bias?

By the way, whats all the electronics up near the front panel?

 

Err the latter I think but could be completely wrong(see I said I was no expert
The electronics is the digital control circuitry for (supply rail?)gain, limiters, meters etc. The audio signal is left unmolested by this circuitry-which is absent from the cheaper T series of amps.
I'm in over my head now Simon

 

Some technical information from MC2, I hope they do not mind I quote this without written permission, it was told roughly like this, not word by word:

"the bias is set by monitoring the distortion waveform, the crossover distortion associated with class A-B amplifiers is clearly visible without any bias (class B) then turn up the adjustment until the distortion is minimized. In fact with the output devices (which are gain matched) and drive circuit, the crossover distortion disappears into the noise floor and is typically 0.002%.
The actual current which the bias is set to (class A) differs from amplifier to amplifier, as it depends on the optimum setting for each set of output devices. It is typically only for the first few watts of output though, and then one bank of transistors is progressively turned off (class B)."

 

Got one of these.... really good... xellent for the Apogee's.... 170 squid off ebay....250w per ch...high damping factor...low imd/thd..wide bandwidth...etc etc..

 

I really like class A. It's a convenient point between the SS class B amps I've owned and the valve amps. As valves are a current no go, the 80watts of class A my Jungson does is rather satisfying!

 

look at Crown K1 and K2 also.

The K1 below (regularly available on Ebay about £500)

is 350w into 4ohm, or buy two and bridge them for 1,500w per channel.

I use one for bass duties on my IPL's.


http://www.dolphinmusic.co.uk/page/shop/flypage/product_id/4275/a/r/e/base

 

That dolphin site's seriously slow- has been that way for years come to think of it.

 

Have you ever tried it full range?

 

Any noticeable difference re fan noise between the T and MC?

 

I've tried the K2, but quickly went back to the valve amp. I liked the bass but little else.

 

The 1250 tends to cycle more often but it is called on to do more work in my set up but they are probably no louder.

 

Hi Uncle Ants

I havent tried it full range in my own system. I got it because my speakers bass is too difficult a load for my 300b amp, so bought specifically to bi-amp.

I'd describe its affect on the bass as making it tight, controlled.

It works for me anyway

 

Ants,
There's a whole raft of 'em for sale on eBay at the mo'.

 

I just checked eBay and you're not kidding Cooky!

 

Hi Andy,
Seems the racked T series have been up for sale before-the MC750 looks a bargain right now tho'.
Hey, I could tri amp my JBLs......

 

well I know ... so does everyone else now

 

Ants, those babies are too heavy for most potential buyers to be interested, i.e. pro users. They all want lightweight, switched mode design now.

 

Exactly how many were you thinking of buying?

 

All five would be nice for my office set up.

 

They're usually as rare as hens teeth s/h so 11 all at once should keep the prices down