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  « FS: Lyrita Audio DHT preamp (Directly heated tubes »
May 20th, 2024, 4:09am
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   [Singapore] HIFI Equipment (Buy/Sell)
   FS: Lyrita Audio DHT preamp (Directly heated tubes
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FS: Lyrita Audio DHT preamp (Directly heated tubes
« on: January 27th, 2017, 4:57pm »

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Hi,
I am selling an extremely bespoke preamp designed by Lyrita Audio: http://www.lyrita-audio.in/

It uses DHT (directly heated triodes) at the output stage.

It is a single stage preamp with no driver tube or input tubes to color the sound. The Signal is directly fed to the pair of 4P1L DHT tubes which provides 12db of gain. The output stage is transformer coupled for a robust low impedance high current output. It cannot get simpler and purer than this.
The power supply is very elaborate with 4 power transformers (1 each for the DHT tubes, 1 for the heater of the rectifier tube and 1 for the high voltage supply).

Here are the interesting bits about the parts utilised. This is a completely souped up version with Dave Slagle Nickel permalloy transformers and chokes. Here are the complete list of exotic parts that has gone into it:

1. Dave Slagle (Intact Audio) Permalloy 80 (80% Nickel core) output transformers
2. Dave Slagle Permalloy 50 (50% Nickel Core) chokes
3. Dave Slagle Autoformer (AVC) volume control
4. Elna 6 way source selector
5. Specially ordered teflon sockets from Italy with pure copper pins for all 3 tubes.
6. WBT Nextgen Copper RCA connectors (3 inputs and 1 output)
7. WBT Silver Solder for internal wiring

These parts alone cost me upwards of $4000, then the additional cost of all the other parts and build by Lyrita Audio.

This preamp replaced my earlier Shindo Aurieges and Supratek Cortese. Now I have moved to an all Audio Note setup with an M6 phono preamp so I do not see this preamp getting much use from here on.
I am asking $2750 for this preamp. Contact me at 98500407


Here is a review of Dave Slagle Autoformer volume control:
https://parttimeaudiophile.com/2013/09/22/slagle-autoformer-volu me-control/
http://www.enjoythemusic.com/diy/0611/slagle_autoformer_volume_c ontrol_modules.htm

Here is a pic of my preamp:

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