What is the DCR and how much power can they handle? Diego

Can you share the specs and price?

I don´t think Torpedo III will substitute Torpedo I as they will have different sound signatures. Many people will probably want to keep both.

Thank you for your answers. I am looking forward to see the final result as I have been wanting to build something like that for the last few months.

Sorry, I had not seen this. Those are DN2540 mosfets.

So ... is it an AC coupled series push pull Mosfet mu follower?

Mainly for better thermal efficiency. Shunt regulators waste a lot of current particularly in the case of the WaveIO. This card uses a lot less current when playing 44.1 khz material than it uses when playing 384khz but if you want it to be able to do 384khz you have to set the current for it...

Thank you guys.   For the power supply I used AMB Sigma 22 and Sigma 11 power supplies. The first has a +15 and -15 output and feeds the IVYIII amplification stage and the second has a +5 volt output and feeds the DAC and WaveIO  USB converter. Additionally, both the DAC and WaveIO have their...

After four months of work I finally finished my Buffalo IIISE . It is a very nice upgrade over my five year old Buffalo DAC.                 Added higher resolution pictures.

  They are basically the same. The only differences I have seen over the years are the quality of the output cap and that very old ones had a resistor at the output that significantly increased the output impedance.   Diego

You can not use a 6n6p because it needs 6.3 volts on the heaters and the HD2 works with 12.3v . In the case of the 12bh7, you can plug it in and nothing bad will happen but the ecc99 works better in that amplifier.     Regards,   Diego

The tubes might not have enough life left. In any case, it's a good idea to have an extra set of tubes, it helps you troubleshoot and sooner or later you will need them anyway.   Diego

This is my highly modified SP Extreme clone.     With regulated B+   I used one of Pete Millett's regulated heater supplies for the 6sn7 with it's own independent transformer and elevated ac for the 6as7 heaters. Originally I used the same pot the Extreme had but now I want...

It's not for the energy stored. The cap forms a filter with the headphones and cuts off the bass. For instance, if you are using 300 ohm headphones,  you will have no bass below 5.83 hz with a 91uf cap but you'll have no bass below 12.94 hz with a 41uf cap.   As a reference, I have an...

That amplifier uses 6sn7s in all positions. The first socket is for the input tube and the other two are for the output tubes so it is better to use identical tubes on those sockets.

I´m almost sure the transformer on the MAD is capable of 230v but the amplifier would need significant internal work.   Regards,   Diego

@digic25   The heater supply is designed for 12v and it´s one of the advantages of the Ear HD. Working at 12v allows the heaters to work with half the current which makes them quieter, in addition the amplifier produces less heat. I suppose it´s possible to add resistors to drop the voltage...

@digic25   You can´t use a 6922 tube in the HD2. The heaters on that amplifier work at 12.6v and the 6922 works at 6.3v. You will surely ruin your tube in a short time.

The tubes are the right ones. However, some tubes hum when ac heated and most amps that use 6AS7s are ac heated because of the current consumption.

@tdotzghmn - 6080, 7236 and 5998 are similar tubes. The main difference is the transconductance which is around 6500, 12500 and 15000 respectively. For a cathode follower like the WA2 the higher the transconductance the lower the output impedance. So, if you already have a Tung-Sol 5998 you...

Those tubes look exactly like mine if that helps. The scale on the TV7 D/U does not go to 100%. For instance the minimum on a 6080 is 36  and on a 5998 is 40. The problem is that I couldn't find the 7236 in the manual so I don't know how they tested them.

I also highly recommend  using the 370DAX transformer. The 200 series tend to run hotter.

That's right, when you take out the tube rectifier the transformer will have a significantly lower load. If you use a 270DAX the heaters will come up significantly. On the other hand, if you use the 370DAX which has better regulation the increase will be smaller. As Holland says, you could fix...

Diodes won´t produce hum but they might produce some high frequency noise depending on the design and the diodes. You would loose the soft start feature but the bass would be a little faster and harder. The voltage would be higher and the regulator would dissipate more heat keeping it at 250vdc...

I would try moving the signal cables away from the heater wires first. The heater wires are the twisted red and yellow ones. Do it with a chopstick as you did ( as long as it´s made of wood or plastic) and be very careful because there are deadly voltages inside that amp.