Build stereo valve amp - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

14th Oct 2014, 2:30 pm

Wood can look quite good, see... https://www.vintage-radio.net/forum/...7&postcount=40

Restoration73 · 15th Oct 2014, 11:39 am

Some time back I restored (rebuilt !) two Dulci DPA10's based on the 5-10 design.
It was shocking that the fine original design had been executed with very poor
components, so modern components will yield an even better performance, as I found.
However if a lot of work is involved the 5-20 design may be preferable.

Neil Purling · 17th Oct 2014, 7:09 am

I made a Mullard 3-3, which is loud enough for me. The transformers are going to be the biggest pain in the wallet. I am thankful that Forum member Mr Dinning was able to provide a re-cycled fully shrouded power transformer and wind a o/p transformer as well.
The 3-3 uses valves which are not expensive. I used a Svetlana EF86 & a re-cycled Reflektor EL84 that escaped from a Rigonda stereo system. New examples are easy enough to get & the 300V HT isn't going to hammer them to death.

Ed_Dinning · 17th Oct 2014, 9:08 am

Hi Gents, many people have commented on how good the 3-3 sounds in a domestic location and I've done a few transformers for them now.
The amp itself has enough sensitivity for most modern sources, but if extra gain is required there are 2 good pre-amp designs in the Mullard book that can accompany it and can be powered from the 3-3.

Ed

14th Oct 2014, 2:30 pm	#21
Guest Guest Posts: n/a	Re: Build stereo valve amp Wood can look quite good, see... https://www.vintage-radio.net/forum/...7&postcount=40

15th Oct 2014, 11:39 am	#22
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Build stereo valve amp Some time back I restored (rebuilt !) two Dulci DPA10's based on the 5-10 design. It was shocking that the fine original design had been executed with very poor components, so modern components will yield an even better performance, as I found. However if a lot of work is involved the 5-20 design may be preferable.

17th Oct 2014, 7:09 am	#23
Neil Purling Nonode Join Date: Jul 2005 Location: Hull, East Yorkshire, UK. Posts: 2,087	Re: Build stereo valve amp I made a Mullard 3-3, which is loud enough for me. The transformers are going to be the biggest pain in the wallet. I am thankful that Forum member Mr Dinning was able to provide a re-cycled fully shrouded power transformer and wind a o/p transformer as well. The 3-3 uses valves which are not expensive. I used a Svetlana EF86 & a re-cycled Reflektor EL84 that escaped from a Rigonda stereo system. New examples are easy enough to get & the 300V HT isn't going to hammer them to death.

17th Oct 2014, 9:08 am	#24
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Build stereo valve amp Hi Gents, many people have commented on how good the 3-3 sounds in a domestic location and I've done a few transformers for them now. The amp itself has enough sensitivity for most modern sources, but if extra gain is required there are 2 good pre-amp designs in the Mullard book that can accompany it and can be powered from the 3-3. Ed