were not worthy
SEPP Hybrid Amplifier
This is a SEPP amplifier I built to test the concept of a push-pull amplifier using a triode and a MOSFET, where the MOSFET is driven to produce the complementary signal current of the triode (all class A1 of course)
It produces a SE harmonic signature and uses a PP output transformer. Power output is the same as a standard 2 tube PP.
This amp uses a 6BX7, one system as driver and the other as the output triode. This is a good tube for this application because one anode can be run at much greater current than the other (like in the vertical deflection oscillator + amplifier circuits it was designed for), limited by the total tube dissipation.
This amp produces 4 watts from 2V RMS input signal using one tube, one MOSFET, an op amp, and a few passives. It uses no NFB.
The MOSFET and opamp are integrated into the octal base device with heasink on the left I call an OpFET. This allows the chassis to be wired all point to point like a regular tube amp. Since it has to dissipate as much as the tube anode it does put off some heat!
Michael J Koster
This is a SEPP amplifier I built to test the concept of a push-pull amplifier using a triode and a MOSFET, where the MOSFET is driven to produce the complementary signal current of the triode (all class A1 of course)
It produces a SE harmonic signature and uses a PP output transformer. Power output is the same as a standard 2 tube PP.
This amp uses a 6BX7, one system as driver and the other as the output triode. This is a good tube for this application because one anode can be run at much greater current than the other (like in the vertical deflection oscillator + amplifier circuits it was designed for), limited by the total tube dissipation.
This amp produces 4 watts from 2V RMS input signal using one tube, one MOSFET, an op amp, and a few passives. It uses no NFB.
The MOSFET and opamp are integrated into the octal base device with heasink on the left I call an OpFET. This allows the chassis to be wired all point to point like a regular tube amp. Since it has to dissipate as much as the tube anode it does put off some heat!
Michael J Koster
Attachments
The "woodwork" in JeanGodbout's amp could very well be a technique used to make interior parts for car dashboards and doorpanels...it is called something like liquid wood where a thin layer of texture is sort of flushed on the surface.
Sorry, can* t decribe it better.
Very nice looking anyway!!
Sorry, can* t decribe it better.
Very nice looking anyway!!
Re: My new J.E. Labs 300B
JeanGodbout, what a workmanship! Congratulation! This is what I admire to DIY'r they are trying to build something that even looks better than some mass produce tube amp in the market.
Looks good as it sounds! More power to you and more DIY to show!
JeanGodbout said:
JeanGodbout, what a workmanship! Congratulation! This is what I admire to DIY'r they are trying to build something that even looks better than some mass produce tube amp in the market.
Looks good as it sounds! More power to you and more DIY to show!
![grounded3_009[1].jpg](/community/data/attachments/104/104141-cf77b96701887624170b6fa4547fdd80.jpg)
![grounded3_006[1].jpg](/community/data/attachments/104/104163-5b4829fcdfced407e0ed2496236569d3.jpg)
In the preliminary 'where does this go!!' stages...they'll be patched up to the chassis with twisted and braided wiring. Note the heater wiring is NOT on the PCB....!
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An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
