1st time rolling

Its not my Amp ive been playing with...its my CDP, changing valves as i understand (im new to this) can bring improvements or change the tone of any said equipment, as all valves have a code to them that determines their electrical charateristics, buying a different 'Brand' shouldn't cause any problems.... The valves i bought were Russian jobbies and only $20 +postage for a matched pair ..... If i was inclined to be a ''Detail is everything'' kind of guy then i would have kept the new valves inplace, but im not and have kept the stock tubes for reasons i posted earlier.

I see. Regardless of the equipment though, valves are used for signal amplification (sorry, pedant mode initiated).

How do you go about choosing replacement valves that are supposedly going to give an improvement, as opposed to doing the opposite? Is it a case of trial and error, or is there some kind of claculation process going on? I wouldn't have thought that the designers arbitrarily installed one particular type of valve, but the amount of people seemingly engaging in valve rolling would suggest that they might as well do so.

Trial and error mate, you can research ya kit online and see what others have done via their valves but its not a science as such...the ones i chose were ment to be the same as WE (Western Electrics) of which i have heard of good results..... but the WE's are $90+ plus carriage..... as i said before there was an overall gain in definition and detail.....but at the sacrifice of emotion/realism...... so where my CDP is concerned, if it aint broke im not gonna fix it.

Ok, thanks for that.

Those Morels BTW, are they ICE drivers?

ICE lmao! you mean NICE your more than welcome to come have a look and listen...... just bring some Guiness with you 

Guiness? Now a nice medium cider and we're talking.

I did a search for Morel and ICE speakers were the top search returns. I've since found their website and the hifi and separate driver range. They do look the business, mind.