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

First time baby Huey amplifier build
First time baby Huey amplifier build
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 18th October 2010, 05:35 AM   #1
mossmamc is offline mossmamc  United States
diyAudio Member
 
Join Date: Oct 2010
Location: Sarasota, FL
Default First time baby Huey amplifier build

I have chosen to build a monoblock version of the baby huey amplifier design for my first build. For those of you who have done this before, I have a few questions.
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

First off, could I use a 5Y3GT rectifier tube instead of the solid state rectifier shown in the diagram? Additionally, what is the CCS subcircuit, and what role does it play? I am confused about what the function of the LED is, and why the schematic shows two wires going the other channel's CCS. Since I am building a mono amp, what becomes to those two wires? Additionally, since I am building a mono amp should I change the pair of resistors on the leads going to HT left and right to a single resistor equivalent to the parallel set? If you have any input I would really appreciate it.

Thanks,
-Matt
  Reply With Quote
Old 18th October 2010, 06:52 AM   #2
adamus is offline adamus  United Kingdom
diyAudio Member
 
Join Date: Apr 2008
re 5y3gt, yes i dont see why not as long as you obey it's max cap ratings etc. You will need to use the 5v winding on you power tx, so will have to think how you will get the -15v for the CCS.

The CCS is a morgan jones design (see book 'valve amplifiers') the led provides a Vref, take the VBE of the lower bc547b (0.7v) from the 1.7V led ref to give the voltage through the 1k. 1v / 1kr = 1ma CCS for the phase splitter. two wires go as you need a -15v supply, and the ground.

just use the single 47R, you may need to tweak for the final desired B+. If you are using a valve rectifier you will probably need choke, do a CLCRC supply, tweaking for the first C for setting B+. use the duncan amp tools PSU simulator to help.
  Reply With Quote
Old 18th October 2010, 02:54 PM   #3
nightanole is offline nightanole  United States
diyAudio Member
 
Join Date: Feb 2009
220uf on a bottle rectifier????
And the bottle rec will decrease the b+ like adding a 150ohm resistor in line...
  Reply With Quote
Old 18th October 2010, 04:57 PM   #4
Soonerorlater is offline Soonerorlater  United Kingdom
diyAudio Member
 
Soonerorlater's Avatar
 
Join Date: Jul 2008
Location: Belfast
Quote:
so will have to think how you will get the -15v for the CCS

If you're using the Freed transformer I think I saw a spare 6.3v (0.9A) tap that could be used to provide your negative supply, will give about -17v but thats ok ( see post 5 of Baby Huey thread )
  Reply With Quote
Old 18th October 2010, 05:06 PM   #5
mossmamc is offline mossmamc  United States
diyAudio Member
 
Join Date: Oct 2010
Location: Sarasota, FL
Quote:
Originally Posted by Soonerorlater View Post
If you're using the Freed transformer I think I saw a spare 6.3v (0.9A) tap that could be used to provide your negative supply, will give about -17v but thats ok ( see post 5 of Baby Huey thread )
Yes, I am using that Freed transformer, thanks for the info.
  Reply With Quote
Old 18th October 2010, 05:27 PM   #6
Soonerorlater is offline Soonerorlater  United Kingdom
diyAudio Member
 
Soonerorlater's Avatar
 
Join Date: Jul 2008
Location: Belfast
That's good, voltage doubler draws very little current so can be used for your second channel later on
  Reply With Quote
Old 18th October 2010, 08:41 PM   #7
mossmamc is offline mossmamc  United States
diyAudio Member
 
Join Date: Oct 2010
Location: Sarasota, FL
Another question, my power transformer is rated at 750 volts center tapped, in order to get the voltage closer to the 350 range, I was planning on wiring the rectifier between the center tap and one outer tap to get half the voltage. Will this work for the Baby Huey design, or am I looking at it the wrong way?
  Reply With Quote
Old 18th October 2010, 08:56 PM   #8
aardvarkash10 is offline aardvarkash10  New Zealand
diyAudio Member
 
aardvarkash10's Avatar
 
Join Date: Mar 2007
Location: Auckland, NZ
you are looking at it the wrong way. 750V CT is 375V per side of the centre tap, each operating on opposite phases - in effect two 375V OPTs operating side by side. Just follow the diagram sir. And download Duncan Amps PSUDII and get used to using it! It saves heaps of time and answers a lot of questions.
__________________
"It may not be easy for some to not hear differences, even if they are not there." - Vacuphile,
  Reply With Quote
Old 18th October 2010, 08:59 PM   #9
boywonder is offline boywonder  United States
diyAudio Member
 
boywonder's Avatar
 
Join Date: Jan 2008
Location: So.Cal.
Quote:
Originally Posted by mossmamc View Post
Another question, my power transformer is rated at 750 volts center tapped, in order to get the voltage closer to the 350 range, I was planning on wiring the rectifier between the center tap and one outer tap to get half the voltage. Will this work for the Baby Huey design, or am I looking at it the wrong way?
You want a full wave center tap, see pic:

Note: Disregard the component values, the FWCT config is what is relevant.
Attached Images
File Type: png FWCT.png (12.0 KB, 879 views)
  Reply With Quote
Old 18th October 2010, 10:48 PM   #10
mossmamc is offline mossmamc  United States
diyAudio Member
 
Join Date: Oct 2010
Location: Sarasota, FL
Quote:
Originally Posted by boywonder View Post
You want a full wave center tap, see pic:

Note: Disregard the component values, the FWCT config is what is relevant.
Ok, I got the power supply design software, and I have what I believe is a working arrangement. It puts out 350 volts and draws .33A plate current once the transients die out. Take a look at this arrangement and let me know if you see any flaws.

An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.
  Reply With Quote

Reply


First time baby Huey amplifier buildHide 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
Baby Huey components WindChill Tubes / Valves 15 12th March 2010 06:39 PM
Building the Baby Huey EL84 pushpull amplifier Bas Horneman Tubes / Valves 0 19th October 2009 08:21 PM
Could this become a Baby Huey killer ? Jaap Tubes / Valves 240 7th May 2009 07:09 PM


New To Site? Need Help?

All times are GMT. The time now is 08:49 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki