Why 80 watts as a lower limit? Have you calculated what SPL that will produce?
Ron’s New System
- Thread starter Ron Resnick
- Start date
First Ron should get the information from Jadis about the proper value. As far as I know they should not be willful to do it ...
No; but I believe in headroom in a way that I think you do not.
At 80 JA100 watts, listening at 95 to 97 dB peaks, Don thinks he heard a little bit of running out of gas on Mahler's 3rd symphony.
Interesting. It is no only about peaks, if it is not driving it sufficiently the dynamic range will be getting compressed elsewhere.
Ron,
IMO an old used Jadis JA200 fitted with EL34's would be an excellent choice for your system. In Europe we sometimes can get them around 10k euros. Remember the Stereophile review of the Jadis JA200 mkII
"Like all of Jadis's long-standing models, the JA80's basic circuitry and Jadis-made output transformers remain unchanged. The circuits of nearly all Jadis amps share the same basic push-pull design, have the same number of stages, and use only a small amount of negative feedback. The goal is to maintain the Jadis sonic signature throughout the line."
and
"In the JA200 Mk.II, launched in 2016, the power transformer and cathode circuit have been modified to accept Russian-made Tung-Sol KT150 power tubes. The chassis are made of 304L polished stainless steel, and the characteristic Jadis golden plating is brass."
IMO an old used Jadis JA200 fitted with EL34's would be an excellent choice for your system. In Europe we sometimes can get them around 10k euros. Remember the Stereophile review of the Jadis JA200 mkII
"Like all of Jadis's long-standing models, the JA80's basic circuitry and Jadis-made output transformers remain unchanged. The circuits of nearly all Jadis amps share the same basic push-pull design, have the same number of stages, and use only a small amount of negative feedback. The goal is to maintain the Jadis sonic signature throughout the line."
and
"In the JA200 Mk.II, launched in 2016, the power transformer and cathode circuit have been modified to accept Russian-made Tung-Sol KT150 power tubes. The chassis are made of 304L polished stainless steel, and the characteristic Jadis golden plating is brass."
Yes, this is the amplifier I thought Kedar was referring to. I have heard this amplifier.
A big part of the equation for me if I experiment with something other than Jadis, is to find a medium power amplifier which has some or all of the Jadis "weight" in the upper bass to lower midrange.
Even a wonderful 833 SET amplifier which is "neutral" through that frequency range would not work for me. I don't want thin or neutral in that frequency range; I want full and weighty in that range -- like Jadis.
I completely agree! I would love to try JA200 Mk. IIs with the cathode resistors calibrated for EL34s.
It looks to be a real bargain:
https://www.audio-markt.de/en/market/jadis-ja-200-series1-5505607842
But we have to collect them in Germany!
Thank you, but whatever improvements were made in the Mk. II version and maybe later versions I definitely want those production upgrades.
Remember -- have to protect the RD75s in the Pendragons. Leaving the protection circuitry of the Siegfried IIs already makes me very nervous.
Remember -- have to protect the RD75s in the Pendragons. Leaving the protection circuitry of the Siegfried IIs already makes me very nervous.
Ron, I looked back at my texts after you sent the Mahler 3 video to me. Bass on that Don is saying in the room, I think your Jadis is not appropriately driving it, and it is not just peaks. 80w is sufficient for loudness, it is lack of drive of the ribbon that is the issue.
If you play it on VTL we can confirm.
If you play it on VTL we can confirm.
Thank you, but whatever improvements were made in the Mk. II version and maybe later versions I definitely want those production upgrades.
Remember -- have to protect the RD75s in the Pendragons. Leaving the protection circuitry of the Siegfried IIs already makes me very nervous.
In most tube amplifiers, such as the Jadis, the RD75 are intrinsically protected by the amplifier output transformer, that blocks DC.
But if you are concerned with such aspects you should accept that the Jadis JA200 internals are a real mess, not comparable to the excellent and neat Siegfried II building quality:
From https://getpointlee.blogspot.com/2020/03/repair-jadis-ja200.html
Inexpensive EL34's in a Jadis? We will probably have fireworks at Ron's soon ...
They need very well matched tubes, with the proper burn-in.
I just received eight Siemens EL34s.
I just don't know if I can pop them into the JA100s without any modifications.
I don't consider that to be a "mess." In high-end audio electronics I actually prefer point-to-point wiring over circuit boards.
Why not a manley snapper mono amps 110w from 4× el34 with a much better drive stage ecc83+ecc 182/5867 tube that kicks.
www.manley.com
Manley SNAPPER® Power Amplifier — Manley Laboratories, Inc.
The SNAPPER's 100 Watts at full power across the entire frequency band from a quartet of EL34’s in a fully differential circuit topology is only achievable with an impressive 19-layer output transformer designed and wound by us here at Manley Labs, of course.
www.manley.com