2P29L DHT preamp (again)

Well, after enjoying the 2P29L as part of the Mule preamp project, I decided it was worth building it so I can continue with my adventures on the DHT land.  The 2P29L sounds so good that is worth having it as a standing preamp so here is my new version in progress. Thanks DHTRob for your inspiration using the IKEA chopping boards in a slightly different way I used them so far:


Simple and neat. The 2P29L were stripped out of their aluminiun cans. Naked as when we come to life.  The gyrator boards are ready and tested. Just need to get the Rod Coleman regulators and complete the wiring. 

Happy DIY audio!

Author: Ale Moglia

"A mistake is always forgivable, rarely excusable and always unacceptable. " (Robert Fripp)

6 thoughts on “2P29L DHT preamp (again)”

    1. A holesaw, they work like a charm, specially in wood. You can buy them in the diameter you need. You need to drill from both sides given the thickness of the wood.

    1. Hi Barry,
      Yes, it’s very simple to remove them as you can see. The trick also is to mark pin 6 at the bottom of the glass bulb where the pins are located to use it as a reference for placing the valve in the loctal socket. You can identify this pin as have a different glass shape around it.
      Cheers, Ale

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