I'm not saying modifications are necessary. I wrote "I just don't know."
I think KT88/6550/KT90 are all more similar to each other than any of them is to EL34.
I do know that the JA100 was designed specifically around the KT90.
Ron’s New System
- Thread starter Ron Resnick
- Start date
I think KT88/6550/KT90 are all more similar to each other than any of them is to EL34.
I do know that the JA100 was designed specifically around the KT90.
I ordered Cardas Clear Reflection with Cardas SLVR RCAs (no rhodium) for the long run and for tape to preamp and phono to preamp.
Banish 'ye rhodium! Begone!
Banish 'ye rhodium! Begone!
Correct me if I'm wrong, but does this mean a 'compromise' current is used to accommodate both types of power tubes in such amp design of the old JA200 instead of the optimal current for either EL34 or KT88?
Absolare Push-Pull (2 x 845, 85 watts, mostly Class A, push-pull)
MastersounD PF100 (4 x 845, 110 watts, Class A, PSET)
Jadis JA200 (10 x EL34, 90 watts, Class A, push-pull)
MastersounD PF100 (4 x 845, 110 watts, Class A, PSET)
Jadis JA200 (10 x EL34, 90 watts, Class A, push-pull)
Has anyone actually heard the Absolare Push-Pull in a home listening room? All of the reviews are about the Absolare SET, not the Absolare Push-Pull.
compared it in triode and pentode mode to Ongaku (stock valves) with Diesis. The Absolare in pentode was better, but there was no Kondo pre, and anyway the system did not sound anywhere as good as Chris' in Dallas with all Kondo.
My turntable shootout of Brinkmann Balance with LaGrange and Monaco and AF3 had the Abolare integrated with Martens, but no amp compare.
Do they have the "weightiness" in the upper bass to lower midrange of the Jadis?
which is the one in triode and pentode mode? There is definitely one. This was 4 years ago, I am sure green switched modes, but is a SET than can switch to pentode. The hybrid was the push pull but not 845
ETI Research Silver LINK RCA Connector
ETI Research Silver LINK RCA Connector in stock at MCRU
www.mcru.co.uk
Ahhhh , Somewhat tardy I see , as you were.
Last edited:
Yes. The maximum rating anode power of the EL34 is half of that of the KT90. In order to operate the tubes in a safe way, they should reduce the bias current around 50% and available power in class A scales with the square of the current - you will get that power only in class AB.
Again, you will quickly go in fireworks in order to get such class A power from EL34's. Replacing KT90's with EL34 optimally would also need a new power transformer and output transformer.
I'll explain to you using two pictures how differently two types of tubes act. with the same anode voltage and the same cathode resistor.anode 465volt and current 45mA.
Please do not pay attention to the scale, it is drawn freehand. You can see in the two pictures El 34 and the KT 88 and their characteristics. x and y axis anode voltage and current. The curve characteristic is the negative bias voltage on the cathode resistor flows.
With the KT 88 you can see that the operating point is closer to the lower bend in the curve, which means the tube works less cleanly and produces more distortion.
With the EL 34 you can see that the operating point is in a much straighter part of the curve line. The tube works more linearly, cleaner with less distortion.
If we assume this operating point, I would always prefer an EL 34 to the KT 88.
I hope it was understandable.
P.S
That's why it's important to adjust the cathode resistor of the tube you plug in if you want to get a good result.
Last edited:
I recommend the ETI Kryo RCA plug. Tellurium copper with silver plating, no rhodium, low mass, excellent tonal balance and detail. With two retaining bolts, it also has secure cable connections and should be very reliable. I have tried many RCA plugs including the WBTs but the ETI Kryo is now my go-to choice. Available from Hifi Collective in the UK (with 3-day delivery to the US).
ETI Research Silver LINK RCA Connector
ETI Research Silver LINK RCA Connector in stock at MCRUwww.mcru.co.uk
Ahhhh , Somewhat tardy I see , as you were.
Because of the tubes and separators and windings in the Cardas cables, I don't think merely a competent solderer can replace the connectors.
Thank you.
I don't think in "coloration" terms, but I think I understand what you're talking about. How would you describe the Jadis coloration?
From a sound point of view, I can recommend this Klei RCA plug copper silverplated. Low mass principle adds hardly any capacity to the cable. Unfortunately, you have to be careful when soldering as it doesn't release a lot of heat. It is best to plug it into a used cinch socket and solder it to prevent the contacts from deforming.
Last edited: