The unique feature is the use of constant current diodes as the plate load on the input stage. 0000001143 00000 n The second or third designs sounded the best. I have also used one of these as a driver for a 40 watt per channel monster 845SE amp. I tried the usual mosfet current sources with good results, although the current is not as constant as I had hoped. The three best sounding designs are presented on the this page.

Now I am actually considering building an even bigger one using 833A's. Want a mod that is easy to do, inexpensive, and makes a huge difference in your tone? Then I had to build a bigger one (the 845SE amp). Excellent for a current source, but that doesn't help if I can't get any. What is needed is a circuit which can provide a constant current over wide voltage range, provide a high dynamic impedance, and operate with a low voltage across the circuit. What can I use in place of the 5842? Start with the one that you can get parts for. Since this amp would evolve into a hybrid "super tube" amp, the sound quality must be excellent. Why a 45 Amp? The diodes are available from Mouser in several values up to a few milliamps. This iteration of the Not Quite as Simple 45 Amp performs better than the original design. The 45 is one of those tubes that is highly regarded by Single Ended Audiophiles. Then I built another one. Try replacing your amp's stock speaker! I will eventually return to designing and building push - pull amps, but for now I am searching for the magic amp design that will sound like the Tubelab SE, have the bass dynamics of the 300Beast, and have plenty of power without requiring a bigger air conditioner. This was cured by operating the 45 filament from a DC power supply. The 10M45 chip can oscillate under some conditions which was fixed by adding a "stopper" resistor of 1K ohms to the "G" terminal. It is coming to this web site soon. All of the mosfets that I have available are enhancement mode devices (the most common mosfet). I can't explain the theoretical reasons for the sound that I am hearing but it is different from anything that I have heard from a push - pull amp, even a class A 300B push - pull amp. �K�-�B�6p�)��� m�����\��~[�l�b�?���3�8�}��hS�W\MK���b�=�. 99 0 obj << /Linearized 1 /O 103 /H [ 1143 425 ] /L 188963 /E 67233 /N 8 /T 186865 >> endobj xref 99 18 0000000016 00000 n There is a clarity that you don't get from the push - pull design. Try replacing your amp's stock speaker!If you found this video helpful, be sure to like and subscribe!NextGenGuitars:https://nextgenguitars.ca/Warehouse Guitar Speaker:https://nextgenguitars.ca/products/wgs-8-g8c-20w-8ohm.htmlT-SHIRTS:https://teespring.com/stores/darrell-braun-guitarTAB STORE:Songs, Lesson Worksheets, and Guitar Techniques!https://www.etsy.com/ca/shop/DarrellBraunGuitar?ref=l2-shopheader-nameDARRELL'S GUITARS \u0026 GEAR LIST!https://imp.i114863.net/vM09jMY AMPS:H\u0026K Grand Meister Deluxe 40 - https://imp.i114863.net/Na1gVMesa Boogie - https://imp.i114863.net/xdVB1PATREON:Become a Patron to be eligible for gear give-aways!www.patreon.com/DarrellBraunGuitarALBUM:iTunes: https://itunes.apple.com/ca/album/celtic-classics-and-instrumental-hymns/1368819279

They all work as shown. The sound quality is better than any of the other CCS circuits that I have tried. I tried several vacuum tubes as current sources and found that the only tube which could hold a constant current over a wide voltage swing is the 5879. Try using one of these in place of the plate load resistor on any low level triode amplifier stage. These won't work well with pentodes, or multi stage direct coupled circuits (like the SRPP). From standard solutions to custom designs, we offer reliable, cost-effective products for mechanical, electrical, digital, analog, miniature, and harsh environment requirements. I needed a simple single ended amplifier with excellent sound. I am providing the information in this update for those who have asked me these questions via e-mail. Stacking two or more of these circuits in series raises the voltage handling capability, but this must be done in a way to insure proper voltage sharing. Unfortunately, I haven't found one. Combine one board, 3 transformers, and some type of enclosure and you have an amp, a very good amp. Given that the driver runs at a constant 10 mA (which can be raised) it presents a low enough impedance to drive the grid of the 45 positive for A2 operation. All three of these circuits were assembled and tested as a single channel test amp. All I have to say is that these things cost less than most tweaks and sound awesome. I have found that the sound quality can be improved by adding a resistor in series with the diodes (about 2K ohms). 0000003587 00000 n

I will definitely try these when they show up. I have received dozens of e-mails asking for the complete construction details, I am sorry to say that there are none. There are a few depletion mode devices in the world but I could not find any in stock at the usual distributors. I have not actually built these designs, but these are good places to start. The CCS IC's have arrived. The 5842 seemed happier with 12 mA of current which required reducing the cathode resistor to 240 ohms. 5 yr p.a.

In the process of developing this design I became so impressed with the sound, that I decided to further develop it into a complete amplifier, the Tubelab SE . I haven't actually built any of these designs using DHT's. Due to the scarcity of reasonably priced 5842's, I have been looking for a different tube that works as good as the 5842.

Within the power limits I can say that this design has sound that rivals any amp that I have built. While searching the web for current source chips and circuits I found several compound circuits using tubes, mosfets, and transistors. Two worked the best. 0000002572 00000 n 0000002802 00000 n The cathode resistor needs to be 220 ohms. w�="R��fΠ=���ڙ�������9���z�2l�52D���Sv��p2螶����m�����){��C�Y7�=�R��#��]�r��! The fourth (and final) design is the Tubelab SE amplifier, which now has its own page. Performance figures are shown in Australian dollar (AUD). However, new ideas are always founded on concepts and theories. Before further discussing the Super-Pentodes and Super-Triodes qualities and applications, I will present a few theoretical thoughts and measurement results. If you don't like the sound, put the resistor back. I originally designed this amp as a building block for a hybrid amp.

AMP Flexible Super Easy Cash.

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