Amp/Preamp Asylum

Looking for a new Amp or Preamp? If you're after tubes, post over here.

Return to Amp/Preamp Asylum


Message Sort: Post Order or Asylum Reverse Threaded

Headphone/Speaker Out from Cathode Follower Preamp

46.19.141.82

Posted on September 28, 2020 at 20:25:11
Joe_S
Audiophile

Posts: 2
Location: Golden Horseshoe
Joined: September 28, 2020

How do I connect a Headphone Out from the cathode Follower Tone stack Buffer prior to the Phase Inverter? (See linked image)
The resistance needs to be either 5 ohms or less. An example of the 5 ohm Headphone Out is the iPod Classic that can also drive small computer speakers.

 

Hide full thread outline!
    ...
What do you mean by 'resistance'? The headphones themselves?, posted on September 29, 2020 at 10:38:47
Ralph
Manufacturer

Posts: 3905
Location: Minnesota
Joined: April 24, 2002
If so this will not work. That cathode follower is fairly high impedance so far as headphones are concerned!

Is this for practice?

 

RE: Headphone/Speaker Out from Cathode Follower Preamp, posted on September 29, 2020 at 11:56:23
airtime
Audiophile

Posts: 10546
Location: Arizona
Joined: February 4, 2003
Take it out from the output on the volume pot, not the cathode follower.

 

RE: Headphone/Speaker Out from Cathode Follower Preamp, posted on September 30, 2020 at 08:08:44
Palustris
Audiophile

Posts: 2130
Location: Cape Cod
Joined: September 12, 2008
Just a thought: if you take the output from the cathode follower (not actually practical without re-design) and the blocking capacitor fails, you will have 160V DC on your earpiece. That could be uncomfortable. If you take the output from the volume control (not at all practical without a redesign) and the capacitor fails you will have 200VD in your ear. That might smart a little.

 

RE: Headphone/Speaker Out from Cathode Follower Preamp, posted on October 2, 2020 at 11:26:24
Joe_S
Audiophile

Posts: 2
Location: Golden Horseshoe
Joined: September 28, 2020

I apologize for not being clear enough.

As there is much discussion here about headphone amplifiers, I was looking for a way to take the 160volts from the tone stack cathode follower and input it into a DIY headphone amp with a headphone/speaker output of 5 ohms as is used by the old classic iPods.

Rob Robinette alread has designed schematics and chassis layouts for a 1 watt speaker tube amp that has a headphone out. I was looking for more information on how specifically to get that 5 ohm headphone out that works for both small speakers and headphones before I dive into laying out and buying components for a DIY tube amp.

 

RE: Headphone/Speaker Out from Cathode Follower Preamp, posted on October 2, 2020 at 13:59:15
Palustris
Audiophile

Posts: 2130
Location: Cape Cod
Joined: September 12, 2008
Notice that in the link you provide that headphone output was done properly: there is galvanic isolation between the headphones and the amp. That's the reason he used an output transformer: the high voltage in the amp is isolated from the headphones by the transformer. A capacitor is not safe. Follow the schematic you provided.

 

Page processed in 0.025 seconds.