Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

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 14th June 2005, 03:46 PM   #1
tade is offline tade  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Ralieigh nc
Send a message via AIM to tade
Default phono amp as headphone amp.

I bought an old record player at a garage sale. five bucks. I am chasing that tube dream in the cheapest way possible. I have no idea how do design a circuit using tubes, so i want to use the pre made one.
This amp takes a signal from the needle and plays it through two small included speakers.
I am sure that the signal coming from the needle is way way lower than a line level signal from a source like a cd player. can i just throw a large resistor in between the source and the amp then hook headphones up to it?
  Reply With Quote
Old 14th June 2005, 08:10 PM   #2
diyAudio Member
 
Join Date: Jun 2004
Location: Kaunas
If the phono is old enough it has piezoelectric cartridge which output is high (approx. the same as of PC). At first try to connect straight.
  Reply With Quote
Old 14th June 2005, 11:45 PM   #3
diyAudio Member
 
Join Date: Mar 2004
Location: aberdeen, uk
Send a message via AIM to martinab2 Send a message via MSN to martinab2 Send a message via Yahoo to martinab2
Before you connect anything, make sure that the amp is isolated from the mains. Many cheaper units used live chassis amps with ht coming either from a tapping on the record deck motor coil or a dropper resistor. Because everything (speaker, volume and tone controls, pickup cartridge) were insulated, nobody got killed. However what you are planning might just involve connecting your ears or the source components to live mains (electric chair anyone ??)
  Reply With Quote
Old 15th June 2005, 05:23 AM   #4
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
My 5-buck amp is a project likely based on something similar to what you have.

What tubes does the unit have?

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 15th June 2005, 06:39 PM   #5
tade is offline tade  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Ralieigh nc
Send a message via AIM to tade
For one thank goodness the chassi was not part of the circuit! Would have found that out the hard way...
I cleaned off some oxidation and connected it up to a source. Very little amplification and tons of hum. Way more than sound levels. The hum also got louder and softer along with the volume knob.

The unit came from a magnavox tereo unit. the tubes say magnavox on them. the two tall and skinny ones have the numbers.
337 63-48 D-U

and the one fat one says.
348 III

I also have a tube fm reciever. It did an absolutely great job the five minutes it lasted. then the sound started to fade and i heard a slight pop. now all it does is light up and look pretty.
That is actually the extent of my knowledge about tubes. I like the elegant look of tube amp schematics, and I want to learn more about tubes in general. do you have any advice on that as well?
  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
FS: Marantz SR4320 Receiver w/ Headphone out, Phono Stage plus Service Manual mrdon Swap Meet 1 26th March 2007 02:49 AM
Getting headphone output from RCA phono plugs. Please Recycle Headphone Systems 3 19th September 2006 07:00 PM
Bellari VP129 Tube Phono preamp with headphone out. mattjk Swap Meet 0 15th March 2005 08:10 PM
Marantz CD6000 KI - problem between headphone out and phono - any ideas? AlC Headphone Systems 4 23rd May 2003 11:49 AM
Tube Phono Preamp/Headphone Amp trustalbini Headphone Systems 6 14th April 2003 01:41 PM


New To Site? Need Help?

All times are GMT. The time now is 04:47 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