Musical fidelity p270 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th June 2006, 11:34 AM   #1
ingemar is offline ingemar  Sweden
diyAudio Member
 
Join Date: Apr 2006
Location: gothenburg
Send a message via MSN to ingemar
Default Musical fidelity p270

Hi there guys.Sombody who knows how heavy my p270 is biased in class A operation?I have it in a workshop right now and the guy that is modefying the amp is telling me that the maximum output in class A is 1 watt,otherwise im going to destroy my electrolyts.To me it sounds strange that it is just 1 watt in class A operation!!With best regards Ingemar
  Reply With Quote
Old 12th June 2006, 09:06 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
no real data, but I believe this is a high bias amp that puts out 130W into 8ohms in Class AB.

I suspect from the heatsink size (about 15inch by 8inch on each channel) that the bias is set to allow about 25% of maximum power in ClassA. i.e. about 30W being equivalent to 2.75Apk and Ibias of about 1.4A.
__________________
regards Andrew T.
  Reply With Quote
Old 13th June 2006, 03:28 PM   #3
Leolabs is offline Leolabs  Malaysia
diyAudio Member
 
Leolabs's Avatar
 
Join Date: Dec 2004
Location: Bukit Mertajam
Send a message via MSN to Leolabs
Hi,ingemar.You can check for yourself with a multimeter.
  Reply With Quote
Old 13th June 2006, 05:12 PM   #4
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Quote:
1 watt in class A
The P270 was good for 10 watts in class A, bias per side is around 0.8 amps.
Heatsinks of the P270 were SK56 types, which are good for a little under 0.45 C/W at 4" high, 0.36 C/W for 6". Compared to other MF products the P-series had relatively cool heatsinks, the P270 did not run that hot.
Turn the bias up to 30 watts and you can fry eggs on it. The MT200 Mosfet type output stage of the P270(same devices as in the B&W cube amps) makes it a very inefficient class A amplifier.
__________________
The buck stops Here
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Musical Fidelity P270-2 output devices? kenneth Solid State 28 10th January 2012 01:55 PM
Musical fidelity P270 and A370 fets AMV8 Solid State 14 16th September 2011 03:40 AM
Musical Fidelity P270 Lenin Everything Else 9 5th February 2010 01:44 PM
Musical Fidelity X-P200 versus P270/A370 dublin78 Solid State 0 19th March 2006 09:48 AM
Musical Fidelity P270 Lenin Solid State 3 24th March 2002 12:27 AM


New To Site? Need Help?

All times are GMT. The time now is 06:29 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2