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

Instruments and Amps Everything that makes music, Especially including instrument amps.

So your 5E3 is still too loud huh?
So your 5E3 is still too loud huh?
So your 5E3 is still too loud huh? 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 30th May 2014, 03:43 AM   #1
Printer2 is offline Printer2  Canada
diyAudio Member
 
Join Date: Apr 2010
Default So your 5E3 is still too loud huh?

I did a quick build of a 5E3 amp with a couple of changes. The main one is the 6AK6 instead of 6V6's for a big 2-3W. I also included a switch to change the 5E3 interactive volume and tone controls to a regular resistive divider volume controls. I also put in a switch to disconnect the cap on the second stage cathode resistor. I jumpered out the 4.7k resistor after the voltage doubler and went to a 360 ohm resistor for the output cathodes.

Click the image to open in full size.

Click the image to open in full size.

Used a Hammond flat pack transformer for the 6V heaters and used one of the 115V primaries as the high voltage. A 70V line PA transformer for the output transformer.

Click the image to open in full size.

Did a strip board build.

Click the image to open in full size.

A quick chassis out of aluminum.

Click the image to open in full size.

One of my empty cabinets, old 10" console stereo speaker to round it out.

Click the image to open in full size.



So I did mp3 of a work buddy trying out the 6AK6 amp. He has never played a 5E3 so he didn't know how to get the most of the controls. Please be kind to him as this is his first time playing it. I put it on a Microsoft sharing file place, first time I used it also. If you want to hear the amp you can download it.

http://1drv.ms/1hDNpt3
  Reply With Quote
Old 30th May 2014, 11:23 AM   #2
djgibson51 is offline djgibson51  New Zealand
diyAudio Member
 
Join Date: May 2010
Location: Hawkes Bay
Cool. Lots of lateral thinking. Inexpensive and inventive. The photos help get the picture (he he) across.
  Reply With Quote
Old 30th May 2014, 11:19 PM   #3
AmpKiller66 is offline AmpKiller66  United States
diyAudio Member
 
Join Date: Mar 2007
Location: Kansas
Nice project man, way to get creative with cheap parts for a great result! Sounds damn fine as well.
__________________
My band Waffle Stomp: http://www.facebook.com/wafflestompband
  Reply With Quote
Old 31st May 2014, 12:03 AM   #4
Printer2 is offline Printer2  Canada
diyAudio Member
 
Join Date: Apr 2010
Forgot to mention the filter caps were scrounged from electronic ballasts that were defective (from work), the wire was cast offs from building cabling (from work), the knobs were from equipment being replaced (from work), the 70V transformer (from a demolition done at work). I did buy the jacks switches sockets and the cabinet material (although the grill cloth is a place mat that has an open weave design, bought at a dollar store for $2), IEC power connector from an old computer, found the aluminum for the chassis somewhere.

Yeah, didn't cost me much.
  Reply With Quote
Old 31st May 2014, 12:30 AM   #5
AmpKiller66 is offline AmpKiller66  United States
diyAudio Member
 
Join Date: Mar 2007
Location: Kansas
Wow, way to get thrifty!

Sent from my SCH-R530U using Tapatalk 2
__________________
My band Waffle Stomp: http://www.facebook.com/wafflestompband
  Reply With Quote
Old 5th June 2014, 05:13 AM   #6
Poacher is offline Poacher  Canada
diyAudio Member
 
Join Date: Mar 2014
Location: Uxbridge, Ontario
Can't get any cheaper than that. Sure would be a grat candidate for $100 buck amp challenge. I have a question regarding the output tranny. Is there any noticeable hum since the primary windings are not wound like a true push/pull transformer? I'm curious since I have access to a bunch of line transformers through work and if I could use them, I could save on the outputs for my amp projects. I tried downloading the file, but can't seem to get it to go on my IPad. I appreciate any comments on this from others that have used these granny's in their projects.

Cheers
  Reply With Quote
Old 5th June 2014, 07:47 AM   #7
djgibson51 is offline djgibson51  New Zealand
diyAudio Member
 
Join Date: May 2010
Location: Hawkes Bay
Uneven loads (ac or DC) in the OPT will not cause hum. They will cause harmonic distortion.
In a guitar amp this is not a bad thing. I have not built an amp using anything but line transformers in about 4 years. And I build about 4 amps per year - all different.
PS. and I always check out Printer2's ideas before a new build. Especially if it has a switch.

Last edited by djgibson51; 5th June 2014 at 07:50 AM. Reason: Credit where due
  Reply With Quote
Old 6th June 2014, 02:32 AM   #8
Printer2 is offline Printer2  Canada
diyAudio Member
 
Join Date: Apr 2010
Quote:
Originally Posted by djgibson51 View Post
Uneven loads (ac or DC) in the OPT will not cause hum. They will cause harmonic distortion.
In a guitar amp this is not a bad thing. I have not built an amp using anything but line transformers in about 4 years. And I build about 4 amps per year - all different.
PS. and I always check out Printer2's ideas before a new build. Especially if it has a switch.
I'm trying to limit my use of them.

Quote:
I have a question regarding the output tranny. Is there any noticeable hum...
As you can see with the picture of the power and output transformer I have the OT angled. I used some headphones on the transformer's output and moved it around to find the position with the least hum with power going to the PT. I have a little hiss when the amp is on full but no hum, or at least the hum is below the hiss level.

I am pleasantly surprised by the sound out of the transformer. But then again it is 2W through a 10W transformer. I have used a 70V transformer in a 6AQ5 amp and from what I recall it sounded OK.

Speaking of 6AQ5`s, I sort of took them into account when wiring up the 6AK6`s. They have some similar pins and with a switch (yeah, I know, another switch) one of the lines gets flipped to another pin and the cathode resistor gets another resistor in parallel. More or less, don`t have my sheet with me. So the two watts could be bumped up to maybe six. Might be handy when you want to play clean louder, or dirty louder.

Quote:
Sure would be a great candidate for $100 buck amp challenge.
Actually for my final design for the $100 amp I did a 12AQ5 design with an isolation transformer and a 70V line transformer. Could probably get close to sneaking under the $100 doing a 5E3. Part list.

Click the image to open in full size.

Last edited by Printer2; 6th June 2014 at 02:39 AM.
  Reply With Quote
Old 6th June 2014, 02:44 AM   #9
Poacher is offline Poacher  Canada
diyAudio Member
 
Join Date: Mar 2014
Location: Uxbridge, Ontario
thanks Printer2 for your reply. I shall experiment with these inexpensive outputs.

One more question, what taps did you use on the primary side, and did you leave the secondary for the 8 ohm alone?

Kudos to you for the creativity, btw.
  Reply With Quote
Old 7th June 2014, 12:30 AM   #10
Printer2 is offline Printer2  Canada
diyAudio Member
 
Join Date: Apr 2010
Quote:
Originally Posted by Poacher View Post
thanks Printer2 for your reply. I shall experiment with these inexpensive outputs.

One more question, what taps did you use on the primary side, and did you leave the secondary for the 8 ohm alone?

Kudos to you for the creativity, btw.
This is a funny line transformer. It actually has a single primary with a center tap. The secondary is where you change the ratio. For the 6AK6 in P-P I would try to go for anything in the 10k and up range.
  Reply With Quote

Reply


So your 5E3 is still too loud huh?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
SACD ? -- huh ? jmar Digital Source 48 9th February 2010 05:34 PM
huh ? Jaap Tubes / Valves 5 28th February 2006 04:37 PM
Aleph current source: huh? pixpop Pass Labs 5 9th April 2005 07:16 AM
Chip Amps Huh??!!!! alecwek Chip Amps 10 26th July 2004 09:40 PM


New To Site? Need Help?

All times are GMT. The time now is 06:47 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki