Lyrita's Fostex based speaker

Manek schrieb:

Viren Bravo sir Bravo Siva Is your diy amp now in production ? Manek

Manek,

There was hardly any takers for the valve-preamp kit. So we have dis-continued it.

Regards
Siva.

Manek said:

thank you amp_nut do you know of any other speaker who have this arrangement ?

My limited knowledge on the subject is that these are Unique.

Maybe someone on the forum knows otherwise ?

Do share.

Hi Steve,

The RCA ia a tube rectifier.Instead of a glass envelope,it has a metal envelope.

There are diferences in the sound using the various brands of rectifiers.The basic sound of this amp does not change,but there are slight tonal changes.It all boils down to ones preferences. I have used only NOS rectifiers so I do not know what the new production tubes sound like.The BEL is a very good rectifier.

The BEL factory was set up with help from Mullard,and the tooling was suplied by them.The BEL GZ 34 was made using GE parts.Other BEL valves are as good as the vintage NOS .

http://www.tubemonge..._Mullard_OEM_p/3.htm

As far as the 2A3 tubes are concerned the tubes supplied by Viren, the Shuguang 2A3C are the best new production tubes at reasonable prices.The prices of NOS 2A3 tubes are way to high.New production 2A3 from emmision Labs are supposed to be very good ,but very expensve.

Regards
Rajiv

Hi siva

Sorry to hear that. The preamp I heard was good. But then again you are not the one to give up are you ? You have discontinued the kit but how about a fully built one ?

My post actually refered to your solid state power amp. Isn't that what was compared to the plinius ? Or am I missing something here ?


Manek

Hi,

Work is progressing on a more powerful SET amp, but at its own pace. Looking at another slew of transformers, from design to production, is a big enough headache, albiet a pleasant one!

The 845 SET, will be operated at lower voltages, sacrificing on power, but not sound quality. Makes it a lot easier to implement. Hoping to get about 15 watts of single ended power.

Also, looking at a 6C33C SET amp, operated in triode mode. Though not a DHT valve, it runs at much lower voltages, making for an easier design. Should get about 15 watts out.

The Shuguang 2A3C valves are really good sounding ones. I happen to have old RCA double plate 2A3s, and the Shuguangs sound better. The single plate version is the way to go.

Viren

Manek,

Fully built ones are available...but are made against orders only. Specifially with power amp, we happen to carry a couple of new ones in stock..ready to go.

Regards
Siva.

thanks for the link rajiv. good to know made in bangalore rocks! re the 2A3s i figured the KR enterprises ones might be better but that's way way too expensive! there was a link on some forum a guy had compared a host of 2A3s and found the shuguang 2A3C very musical and better than some popular names. will see if i can dig that out.

viren can you list out the 2A3 tubes you compared against the shuguang? so i can cross them out and make a list for whenever i can explore some options?

its fun exploring tubes! cant really swap out a transistor and have fun

thanks!

Viren

The valve for rectification that I use in your preamp is the bel. Unfortunately I haven't had the chance to roll rectifiier tubes in this amp.my other tube amp has solid state rectification.

What kind of change can I expect from say another good nos ?

Manek

Manek

And...viren what upsides and downsides did you find with valve rectifation vs solid state.

Hi Manek,

Your preamp uses the BEL EZ80 rectifier. I really haven't tried out any other rectifier. The current requirement is low, about 25mA, so even this rectifier is just coasting along. A friend substituted a JJ EZ81, which has a slightly higher current rating, for a BEL EZ81, in his amp, and heard a big difference. You could try out the JJ EZ81 too - it'll go into the preamp directly.

Valve or solid-state rectification, again, it's a subjective thing. Both work well. But valve rectification certainly improves the sound - there's more of a sense of flow to the music, and instrument harmonics are reproduced better. With that, for me, there are no downsides.

Viren

Viren,
The ez81 would you consider it a safe replacement ?

Secondly, did bel make 6sn7 tubes ? If they did how do they compare to the sylvanias or the kenrads ?

Btw am back to the kenrads again. Can't make up my mind yet :-) the kenrads do have solid bass, more extended than the sylvanias and more balanced in their presentation to my ears.

Btw any plans to make preamp sections with the 12Ax7 or 12Au7 tubes ? Just curious.

Manek

Hi Manek,

The EZ81 rectifier will fit right in in the preamp.

No, the 6SN7 valves were never made in India. They are still in production in Russia and China, but don't sound as good as the NOS ones from the US. Look on each brand as a different flavour, not necessary to pin one down as better than the other!

I've already worked with the 12Ax series, and really don't care for them. Other valves are so much better. Though, I am forced to use them in very high gain stages, such as phono preamps, because of their lower noise specs.

Viren

Viren
Each are a different flavour and that's why I keep rolling and can't stop :-)

Any other valve you think would do well in a preamp besides 6sn7 and 12Ax ?

Manek

what a great finish !! super..

http://www.my-hiend.com/vbb/showthread.php?t=2053&page=49

this is a great product - super value...

http://img413.imageshack.us/img413/6256/excellentrythm.jpg