Just trolling. Sorry. I have recently come out of playing with transformers quite a bit and despite their simplicity, they can be very interesting toys. I tihnk they are quite marvelous and look forward to hearing how others enjoy them. Maybe Nelson's other article will haev them wired as autoformer with the Vfets as output buffers.
So many questions.... I'd like to build this amp. Probably hardwire it.
The IRF240 and IRF9240 (TO3) are hard to get, any suggestions? Just use an IRFP device? The TO3's will look nicer, I know....
I can get L-profiles which are thick 5mm, Is that enough for a good heat transfer to the main sinks? Or should I look for thicker ones?
Is it wise to separate the PSU's and the Amp, so the Jensen do not pick up anything from the main transformers?
Will a BA3 as a preamp or a Mez DCB1 be a good preamp/buffer for this amp? Cause I think the output impedance of both is higher than 100 Ohms. Maybe I can lower the 220 Ohm output resistor in the DCB1?
That's it for now😀
The IRF240 and IRF9240 (TO3) are hard to get, any suggestions? Just use an IRFP device? The TO3's will look nicer, I know....
I can get L-profiles which are thick 5mm, Is that enough for a good heat transfer to the main sinks? Or should I look for thicker ones?
Is it wise to separate the PSU's and the Amp, so the Jensen do not pick up anything from the main transformers?
Will a BA3 as a preamp or a Mez DCB1 be a good preamp/buffer for this amp? Cause I think the output impedance of both is higher than 100 Ohms. Maybe I can lower the 220 Ohm output resistor in the DCB1?
That's it for now😀
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The amp itself is so simple you could hardwire it, but probably the PSU should be built on a PCB.
*use IRFP
** 5mm is thick enough
*** space between PSU and signal xformers is of premium importance , be it separated with case walls , or not
**** output resistor in Jfet buffer is idiotproof part; feel free to toss it completely
There is no need for TO3 cases. You can easily use MOSFETs with plastic bodies.
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Great, and enjoyable article. Your writing style is clear, informative and concise.
I know, but it will look nicer, more in that period of the 70's -80's.
What Amp is that with the IXYS?
Walter
The 220uF in the CSX1 Amp, what kind of type should it be? Low ESR? Audiophile grade?
Will Panasonic FC 220uF 63V be good enough? bypassed with a 100nF PP 1837?
Will Panasonic FC 220uF 63V be good enough? bypassed with a 100nF PP 1837?
Two caps and two resistors between secondary and sits.
What is function of this components? Filtering?
Thanks for answer
🙂
What is function of this components? Filtering?
Thanks for answer
🙂
Anyone else like the idea of a pooling and matching arrangement? Seems it would be easier to coordinate at the get go.
Hi,
I have couple questions:
- What is the overall gain/sensitivity of this amp?
- Does it need any speaker protection from DC?
- Do Version1 output SITs need to be insulated from the heatsink (since their drains are connected)?
- Can output SITs be of different grade (e.g. KD-33 and KE-33) or the same grade is required?
Thanks,
Vlad
I have couple questions:
- What is the overall gain/sensitivity of this amp?
- Does it need any speaker protection from DC?
- Do Version1 output SITs need to be insulated from the heatsink (since their drains are connected)?
- Can output SITs be of different grade (e.g. KD-33 and KE-33) or the same grade is required?
Thanks,
Vlad
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