Tag: For Sale

4P1L PSE Amplifier for Sale!

Firstly, my apologies to all readers for not writing much over the last year. Things have gone a bit crazy between work and family commitments. Also, modular synthesiser work has taken a lot of interest lately to me. Finally, this blog was hacked twice and have been painful to get it back up again. Needless to say, I’m not an IT expert so I do the best I can!

Selling my beloved 4P1L

All good things come to an end. In this case, my loved 4P1L PSE Amplifier. I moved listening rooms with the growing family and space is now an issue. I no longer can store this beauty and I think it would be wise for someone else to enjoy it rather than collecting dust somewhere my attic (which is mostly full).

This amplifier gave me a lot of joy and sums up a “no-compromise” approach to DHT considering the design and component selection of the power supplies. It’s a very flexible beast as the power supplies (HT and LT) can be used in many different configurations – all the way up to a 300B and more.

4P1L PSE Output Stage
Full 4P1L PSE Amplifier
For the ones who remember my 814 amplifier, I reused the amazing power supplies which were feeding the 46 driver stage. The DHT filament raw supply is similar to these:
One PS per channel (2 boxes on the right in the picture above)
It’s a no-compromise design here. Best custom-made JMS transformers designed to fit this amp supplies with split-bobbins and copper screening.
The HT supply is my design for 300B and 4P1L PSE. It has a lot of capacity which can be reused and is very flexible with its design. It has a surge protection start up circuit and two current meter (one per channel).
I will dig out the circuit and share all documentation for whoever buys this  amplifier.
The amp use MM OPTs, 4mm plate machined by Schaefer.  Filament bias and circuit as per own my design.
All cables provided.
4 valves selected and matched to gm and Ia by me with eTracer
You will need a preamplifier / driver – which isn’t included. Anything with gain of x8 will work (preferably a DHT stage like 01a, 26,4P1L, 2P29L, etc.) – this isn’t included.

 

This is “the one and only” Bartola 4P1L amplifier. It has gone back and forth to ETF.18 and got into quarter finals on the competition (personally and a few others think it could have gone further but listening levels and setup were not the best).

Needless to say:

  • No reserves
  • Payment upfront
  • Only collection in London, UK.  No deliveries
  • Sold as-is. You need to know what you’re doing here 🙂

I haven’t got idea of what price to ask, need to think about it.

If you are interested, ping me.

Cheers,

Ale