Post pics of your builds....
Mar 8, 2018 at 2:59 PM Post #9,796 of 9,804

Audiodoc

New Head-Fier
Joined
Sep 15, 2011
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My EHHA is dead silent. One cannot tell whether it is powered on or off even at maximum volume.
I have crammed a tube heater delay circuit two toroids a low noise regulated supply to my tubes in series a temperature sensor based fan assembly and amb headphones protection circuit in my chassis of 20 x 30 cm.
15205389857631371140442.jpg Initially i had some hum which was coming from the main ground. Grounded the pot screw and put in a main ground isolator. That was it.
 
Dec 18, 2018 at 3:17 PM Post #9,800 of 9,804

HiGHFLYiN9

Member of the Trade: Zynsonix
Joined
Feb 10, 2004
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Finally finished up an interesting build for an Aikido-based OTL headphone amp with enough drive for low impedance cans. The boards are available on ebay for just $30 - hvforless on eBay (no affiliation). They can be configured with 6BL7 or 6BX7, as well as 6SN7, and uses a standard 5AR4 rectifier.

Aikido Octal OTL Tube Headphone Amp High Voltage HF.jpg

Aikido Octal OTL Tube Headphone Amp High Voltage Rear HF.jpg
 
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Dec 18, 2018 at 3:28 PM Post #9,802 of 9,804

Whitigir

Headphoneus Supremus
Joined
Oct 14, 2013
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Balanced out ? Very interesting...the schematic doesn’t show balanced out though ?
Finally finished up an interesting build for an Aikido-based OTL headphone amp with enough drive for low impedance cans. The boards are available on ebay for just $30 - hvforless on eBay (no affiliation). They can be configured with 6BL7 or 6BX7, as well as 6SN7, and uses a standard 5AR4 rectifier.



 
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