Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Amp for Magneplanar 1.6
Amp for Magneplanar 1.6
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
Thread Tools Search this Thread
Old 22nd December 2010, 12:46 AM   #1
Jde is offline Jde
diyAudio Member
Join Date: Dec 2010
Default Amp for Magneplanar 1.6

Hello, this my first post and I hope will not be my last. I would like to build a tube amp for my Magneplaner 1.6's. I have rebuilt a Dynakit ST70 as a class A amp and enjoy its sound quality when driving my efficient cone speakers. But of course the ST70 can not drive the Magneplaner at any volume without clipping and blowing the speakers fuse. I have a pair of Dynakit Mark 3's that need to be reworked, could these 60 watt amps drive these speakers? I would prefer not to spend the money on the Mark 3's and then find out that they can not drive the Magneplanars. I think an amp able to produce 100 watts would work, are there any recommendation? Thanks.
  Reply With Quote
Old 22nd December 2010, 03:33 AM   #2
DougL is offline DougL  United States
diyAudio Member
Join Date: Feb 2004
Location: Wheaton IL.
A Stock ST70 was only able to output 25 Watts RMS with the Stricter FTC guidelines. Class A1 would cut it to maybe 12W? Its not unheard of to get 50W from a PP KT88 / 6550 in class AB. Is that enough? More than 50 Watts involves sweep tubes in near class B, More than one pair of tuber per channel, or very high voltages and transmitter tubes. Good Luck.

Scienta sine ars nihil est - Science without Art is nothing. (Implies the converse as well)
Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus
  Reply With Quote
Old 22nd December 2010, 11:38 AM   #3
roline is offline roline  United States
diyAudio Member
roline's Avatar
Join Date: Sep 2010
Location: East Tennessee
Several of us visited a stereo shop in Santa Clara to check out Magneplaner speakers in 1978. It was almost closing and they put on a good show for us. As we were leaving they hooked up a set to 110VAC to break them in. The mylar film when taught has little bass. I was shocked that this was possible, but was told that they are very inefficient and it was the factory recommended procedure. Scott bought a set and drove them from an amp with 120 watts/channel. Still lacked low bass. There is a Dynaco ST120, 70 on steroids at 60 watts/channel for around $900, or build your own. KT88, KT90, KT120 tubes are available for PP or PPP configuration, Hammond has iron 1650 R or T at 100-120 watts/channel.
  Reply With Quote
Old 22nd December 2010, 02:01 PM   #4
kevinkr is offline kevinkr  United States
diyAudio Moderator
kevinkr's Avatar
Join Date: Sep 2004
Location: Boston, Massachusetts
Amp for Magneplanar 1.6
I ran a pair of MG1.6QR with my 30W 300B triode monoblocks for a couple of years, sounded quite good..

A Dyna MKIII ought to have sufficient oomph to drive a pair without much difficulty, whether or not you like the resulting sound of the stock MKIII with the 1.6 is another question.. Might want to consider a higher performance driver board.

The Citation II would be an excellent choice as well, achieved very good results with a heavily massaged unit with the older MG1.4...

Use the 4 ohm taps on all amps in question..

Note: The 1.4, 1.5, and 1.6 will not survive being connected to the AC mains.. (Their efficiencies are in the low to mid 80s, and is IIRC rated at 2.83V)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine

Last edited by kevinkr; 22nd December 2010 at 02:06 PM.
  Reply With Quote
Old 22nd December 2010, 02:55 PM   #5
andyjevans is offline andyjevans  United Kingdom
diyAudio Member
Join Date: Sep 2003
Location: London
I ran Maggie SMG panels off a Leak Stereo 20 in a small room. Sounded better than a CJ Premier 4, believe it or not. Take note of Kevin's choice of 300b monobloks. These speakers reward quality. Don't be too hung up about quantity unless you play music really loud. There's a lot of mythology about 200 watt amps with Maggies. Take it with a pinch of salt. A friend of mine drove SMGs with a PPP amp with 6SN7 outputs!! Did clip a bit but sounded great.

  Reply With Quote
Old 22nd December 2010, 03:03 PM   #6
Jde is offline Jde
diyAudio Member
Join Date: Dec 2010
Thank you for all the feedback! “Triode Electronics” has a Mark 3 driver board and capacitor upgrade modules, any opinion on these units? The price is within my budget. I used Joe Cursio modules for my ST70, but the prices are now much higher then I remember, it's been 10 years. If I build a new amp, could the driver module for a Mark 3 be used to drive four KT88's or 6550 when using a Hammond 1650TA transformer. Is the Hammond transformer a good choice?
  Reply With Quote


Amp for Magneplanar 1.6Hide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ucd and Magneplanar ecodoppler Class D 2 2nd December 2008 05:14 PM
X250.5 and Magneplanar 20.1 skidave Pass Labs 20 6th November 2008 08:39 PM
Magneplanar/Craigslist/Free x. onasis Planars & Exotics 0 8th July 2007 02:25 AM
Magneplanar 3.3 crossover schematic ecodoppler Planars & Exotics 2 1st February 2007 02:19 PM
Magneplanar ribbon repair? Ouroboros Multi-Way 4 22nd January 2004 07:39 AM

New To Site? Need Help?

All times are GMT. The time now is 06:51 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio