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

Clubs & Events Audio related organizations and events

Greater Toronto Area DIY meetup
Greater Toronto Area DIY meetup
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 4th December 2019, 02:31 AM   #1281
Lo_Tse is offline Lo_Tse  Canada
diyAudio Member
 
Join Date: Dec 2006
Thanks! Much appreciated!! It is a regular preamp, so RCA in and out. I can bring a set. Not sure what connectors your test set used.

Regards,
  Reply With Quote
Old 4th December 2019, 02:43 AM   #1282
rsavas is offline rsavas  Canada
diyAudio Member
 
Join Date: Aug 2012
Location: Georgina, Ontario
It uses BNC, but I have BNC/RCA adapters.
  Reply With Quote
Old 4th December 2019, 03:15 AM   #1283
ticknpop is offline ticknpop  Canada
diyAudio Member
 
Join Date: May 2005
Location: toronto
Greater Toronto Area DIY meetup
Yes I bring my boards, there are several unmodified Haflers there, and the Perreaux 3150 chassis and power supply for a high powered version.
I recapped and CLC filtered the Perreaux‘s power supply so I can’t use the original Hitachi 135/50 devices because now it doesn’t sag enough at full power to stay within the Voltage breakdown limits of the Hitachis. Rails are +/-95 volts.
I have matched sets the higher voltage and current K176/J56 Hitachi devices and a set of the double die TO3 Exicons. The heatsink is drilled for 3 of each device And before some-ones says it can’t work ( Syn08 possibly), remember this amp is 33 years old and had the original output devices still running In it.
  Reply With Quote
Old 5th December 2019, 03:38 AM   #1284
syn08 is offline syn08  Canada
diyAudio Member
 
syn08's Avatar
 
Join Date: Aug 2005
Location: Toronto
Quote:
Originally Posted by ticknpop View Post
. Rails are +/-95 volts.
I have matched sets the higher voltage and current K176/J56 Hitachi devices and a set of the double die TO3 Exicons. The heatsink is drilled for 3 of each device And before some-ones says it can’t work ( Syn08 possibly), remember this amp is 33 years old and had the original output devices still running In it.
It will work, since these are self protecting lateral mosfets and therefore won’t blow in your face, but I would not hope to get much current out of them. They still have only 1S transconductance, which will drop with the drain current and the temperature.
  Reply With Quote
Old 5th December 2019, 04:13 AM   #1285
ticknpop is offline ticknpop  Canada
diyAudio Member
 
Join Date: May 2005
Location: toronto
Greater Toronto Area DIY meetup
It’s going to use Bob Cordell’s new Hafler output stage driver board the Rick has been collaborating with Bob on - to run the shop speakers (100db @ 1 watt) - 2 pairs of them with about 3 ohm minimum load in the bass, most of the time they’ll be running at less than a watt or 2 - except when I play them too loud at Diyaudio meets.

My question will be can I use 3 pairs of the double die 16 amp Exicons to get a higher current output capability that maybe I can’t bias high enough because of heatsink limitations, or stick with the lower current single die 7 amp Hitachis and bias them harder.

Last edited by ticknpop; 5th December 2019 at 04:23 AM.
  Reply With Quote
Old 5th December 2019, 07:01 AM   #1286
syn08 is offline syn08  Canada
diyAudio Member
 
syn08's Avatar
 
Join Date: Aug 2005
Location: Toronto
Quote:
Originally Posted by ticknpop View Post
It’s going to use Bob Cordell’s new Hafler output stage driver board the Rick has been collaborating with Bob on - to run the shop speakers (100db @ 1 watt) - 2 pairs of them with about 3 ohm minimum load in the bass, most of the time they’ll be running at less than a watt or 2 - except when I play them too loud at Diyaudio meets.

My question will be can I use 3 pairs of the double die 16 amp Exicons to get a higher current output capability that maybe I can’t bias high enough because of heatsink limitations, or stick with the lower current single die 7 amp Hitachis and bias them harder.
The double dies exicons will simply double the available current, you can think of 3 exicons as 6 hitachis in parallel.

The problem with these laterals is the large idle power dissipation due to the high required bias. It is hard and doesn’t make much sense to bias them under the zero tempco point (about 150 mA per transistors) meaning that 3 exicons will need almost 1A bias. You do the math for the power you have to dissipate before getting 1W of output power.
  Reply With Quote
Old 7th December 2019, 03:50 PM   #1287
Lo_Tse is offline Lo_Tse  Canada
diyAudio Member
 
Join Date: Dec 2006
Looks like tomorrow is going to be a "warm" day and no snow is expected.
See you guys same time (around 11:30 am ?) same place!!

Regards,

Allan
  Reply With Quote
Old 7th December 2019, 04:29 PM   #1288
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Greater Toronto Area DIY meetup
Beats the heck out of previous years. I would show up regardless of the weather.

-Chris
__________________
"Just because you can, doesn't mean you should" © my Wife
  Reply With Quote
Old 8th December 2019, 01:24 PM   #1289
wlowes is offline wlowes  Canada
diyAudio Member
 
wlowes's Avatar
 
Join Date: Mar 2007
Location: Toronto
See you all soon. Walter
  Reply With Quote
Old 8th December 2019, 02:51 PM   #1290
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Greater Toronto Area DIY meetup
Just waiting for my ride in. See you all soon.

Here he is ...

-Chris
__________________
"Just because you can, doesn't mean you should" © my Wife
  Reply With Quote

Reply


Greater Toronto Area DIY meetupHide 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
Newbie from the Greater Seattle Area skeeter99 Introductions 2 4th January 2011 06:24 AM
Basszilla or Linkwitz Orion in Toronto area? mantisory Multi-Way 5 29th September 2010 03:41 AM
Looking for a serious person in Toronto area rmihai Swap Meet 3 30th May 2010 12:54 AM
Hamfest in Toronto area next weekend TomWaits Tubes / Valves 2 23rd April 2007 02:32 AM
Hamilton/Toronto Area: Anywhere to get LM3875 in person? sardonx Chip Amps 28 26th July 2005 07:32 AM


New To Site? Need Help?

All times are GMT. The time now is 09:36 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki