Preamp to Main amp impedance matching...what's your ratio?

My Sunfire Classic Vacuum Tube Control Center's output impedance is 1.5k Ohms. My Sunfire Series 2 power amp's input impedance is 47k Ohms = 31.333x. And they were presumably designed to go together, if that tells you anything.
 
looking at a triode lab tube pre to go with an mc2105 ss power amp. looks like the Mac has an input impedance of 200k, and when I look at the manual for the triode lab pre, all I can find is input impedence 100k. should I be looking for output impedance? if 100k is the number, will that work with the 2105?

thanks
 
JPJ said:
should I be looking for output impedance?
Click to expand...

Yes. The maker seems to possibly still be a going concern, so you might try asking at

http://www.triodelab.com/contact

Note lack of https protocol, so web browsers will likely complain or even refuse access. It might be a good idea to avoid entering your primary email address.

The maker doesn't seem to be real big on objective product info, so don't be surprised if you don't get a short answer.
 
chazix said:
Yes. The maker seems to possibly still be a going concern, so you might try asking at

http://www.triodelab.com/contact

Note lack of https protocol, so web browsers will likely complain or even refuse access. It might be a good idea to avoid entering your primary email address.

The maker doesn't seem to be real big on objective product info, so don't be surprised if you don't get a short answer.
Click to expand...
thanks, got word that the output impedance is 8k so should be smooth sailing with the 200k on the mac
 
any takes on mixing a modern preamp with a vintage power amp? any reason why not too if the impedances don’t seem to be an issue?
 
Hi there,
In regards with the impedance matching, I'm not a "deep sea diver" into the guts and specs of audio stuff but I reckon the closer the impedances the more accurate control and response. I've got this Linn LK280 that I initially tried on a Cyrus AV8 pre, It sounded well but not ideal, I had the Cyrus up to -30dB volume for decent soundstage, the AV8 is used with a Cyrus Q power amp (they work a treat!) and I barely go over -50dB... conclusion: Cyrus don't match Linn, however, I've found an old Luxman U-100 control preamplifier from a previous stack that I sold and I hooked it up....wow, what a difference! The Luxman output is spec'd at 1.5Kohm, Linn input is spec'd at 5kohm so not a big difference and they sound like a match from heaven! I've got the volume around 20% and I don't need any higher.
Also, in regards with the LK280, I've just noticed when I power it down (from the button) , there seems to be a cap. discharge that I can hear in the speakers, both the same level, same pattern and it goes away after 10-15 sec...It sounds like little clicks and soft "brrr noise". I'll record it next time and post it if I can. My common sense and my fragile experience says it might need a recap sometime in the near future but I'm open to ideas and advice...
 
Don't forget....If you have an amp with a 5k input impedance, you can easily change it UPWARDS. It's a couple resistors.
 
Back in the old days where professional equipmnet used out put and input transformers for maximum power tranfer and to keep circuit reflexions and line loss to a minimum. If more than one piece was being driven the line bridging trans formers were used and a terminating reistor was used to keep everything according Hoyle. Tube equipment had very high operating impedances and the out put impedances with out transformers or cathode follower out puts would be un balanced and easily affected by cables that were un balanced and the reactive components of the circuit. So there fore output transformers and input transformers. Like everything then and now transformers could be be either ho-hum in performance ranging to excellent. But good ones cost big money just as they do today. But good ones never compromised the sound if terminated properly. Basically we bridge outputs today using unbalanced or balanced lines. We all just hope the source impedance is low enough to prevent signal compromises by the load impedance.
 
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