Tag: bartola valves 26

Gyrator PCB boards arrived!

Great pleasure this morning to receive the first batch of the gyrator PCB. After extensive testing we refined the layout and options for the PCB and now we have the final product ready for shipping! Unfortunately I will not be able to do some testing and shipping before end of February and I received a large number of requests already. I’m sure this batch will fly very quickly so please confirm your requests.

Bartola Gyrator PCB

I will post soon the specifications and some circuit examples for this flexible gyrator board which can be used for DHT preamps (e.g. 4P1L, 01a, 26), amplifier drivers, A2 drivers, LTP drivers, parafeed output stages and more!

So check the For Sale section soon for more information.

Some days ago we discussed in DIYAudio using this board for a 2J27L preamp like this one:

2J27L Preamp using Gyrator PCB
2J27L Preamp using Gyrator PCB

The output FET follower is needed to for valves which have low current and high anode resistance which will struggle to drive large capacitances. The FET follower of your choice can be used instead.

A minimal circuit which sounds fantastic is the basic configuration of this PCB. With few changes this circuit can be used on many DHTs like 26, 4P1L, 10Y, 30, 30sp, 12, 71a, 45, 46, etc:

01a Preamp Gen2 with Gyrator PCB board

 

If you want to send me your requests please use ONLY the form below:

Barry French’s 26 DHT preamp

26 DHT Preamp (by Barry French)

After owning several high quality pre-amps & modifying some of them to some degree or another, I decided to have a go at building a top quality unit, so here goes first I needed to build the power supplies for filaments & B+ in a separate case, I already had some idea of the look & design that I wanted to follow, so I sourced the following components from these suppliers:

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26 DHT Preamp Gen2 by Rui Lourenço

Rui's 26 DHT preamp in operation
Rui’s 26 DHT preamp in operation

Here is a great post by Rui Lourenço who finished a sublime incarnation of the 26 DHT preamp Gen2.  I hope you find this post as inspiring as delightful it is for me to see someone taking my 26 DHT preamp version to the next level of perfection. I think Rui’s pictures will speak for themselves showing the great craftsman skills and amount of effort and dedication put into this art work.

My Type 26 Tube Preamplifier adventure – by Rui Lourenço (Portugal)

I’ve started my interest in diy audio about 2 decades ago, basically at that time because I had no means of buying some of the fantastic equipment’s I saw in several Audio Shows, also because the bug was there, and some of my friends were doing it. Today, fortunately I have the means, but the bug was kept and personally I believe that good implemented diy projects can most of the times be several notches above commercial products, or otherwise you would have to spend some important thousands of Euros to acquire them at a similar performance level. You all agree that the personal filling of achievement vs your friends drop jaws when looking to some of the wonderful projects we find everywhere, is also very good.

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