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2359glenn | studio - Page 62

post #916 of 3414
10/16/12 at 3:47am
Quote:
Originally Posted by john57 View Post

Glenn,

 

The Cavalli is a Hybrid amp a very pricey one. It sounds wonderful with the HE-6 headphones. However I heard that the next morning someone decided to “classify” the amp and blew out a channel.  What I was trying to say that this test unit was designed with two set of sockets that can use either octals that have 6SN7 basing or novals that have 12AU7 basing. Only one set can be used at a time and the sockets are arranged in a way that you cannot put four tubes in it at once. It has 6/12v switch and a high voltage switch of 200v or 330v which is half at the tubes.  Part of this is somewhat like you did with the rosgr63 amp.

Your idea of trying the 01A tube is good and the tubes are easy to get.

I have built a amp for someone in New York that is fully adjustable B+ with a pot in a adjustable regulator 150 to 350 volt

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post #917 of 3414
10/16/12 at 5:37am

When I start working on the #45 amp if it doesn't have enough gain maybe I will have

to use a 01A or 71A to the #10 to #45 output. I rather not have a three stage amp but

if knead be I will have to do it. The 01A has a gain of 8 and the 71A has a gain of 3

or have to use a EML 20A or 30A but these tubes are expensive

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post #918 of 3414
10/16/12 at 6:13am

That's a good alternative, the EML 20A Mesh is a beautiful tube.

 

 

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post #919 of 3414
10/16/12 at 10:43am
Quote:
Originally Posted by 2359glenn View Post

I have built a amp for someone in New York that is fully adjustable B+ with a pot in a adjustable regulator 150 to 350 volt

Glenn, 

 

I Like this idea very much especially if you use a SS rectifier. I would call it a sharpness control providing you observe the tube limits.

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post #920 of 3414
10/16/12 at 3:20pm
Quote:
Originally Posted by john57 View Post

The 71A tube, are you serious!biggrin.gif

To add a bit of color what about the ARCTURUS BLUE???blink.gif

Did I suggest something silly perhaps? 

 

I know it is normally an output tube but it seems to work well as a driver according to DIY circles.  Was thinking that or a 46 could drive big DHTs like 300B better than a 6SN7 could.

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post #921 of 3414
10/16/12 at 3:26pm
Quote:
Originally Posted by 2359glenn View Post

When I start working on the #45 amp if it doesn't have enough gain maybe I will have

to use a 01A or 71A to the #10 to #45 output. I rather not have a three stage amp but

if knead be I will have to do it. The 01A has a gain of 8 and the 71A has a gain of 3

or have to use a EML 20A or 30A but these tubes are expensive


I'm a little relieved to hear this actually.  I've been doing some independent study on things that could be done for the 3rd stage so I could have more informed conversations with you if the need came up.  The 71A or the 46 are the two tubes that I had in mind to use as the additional stage, so seeing you mention the 71A as well lets me know that my understanding of the things I've been reading has to be at least partially right.

 

I gave some thought to the EML tubes as well, but they're so expensive and if Emission Labs ever shuts down or stops producing the tube then we're up a creek.  That, and it would probably make the whole project more expensive again too.  What drew me to the 71A is that it seems to be a pretty cheap tube still, nobody really using them now.  I found lots of pairs in the $20-30 range.

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post #922 of 3414
10/16/12 at 5:28pm
Quote:
Originally Posted by Xcalibur255 View Post

Did I suggest something silly perhaps? 

 

I know it is normally an output tube but it seems to work well as a driver according to DIY circles.  Was thinking that or a 46 could drive big DHTs like 300B better than a 6SN7 could.

Actually the driver does more for the SQ then the output tube. The 6SN7 can barley drive a 300B but a10 or a 46 at 1.5 watts can easily drive just about any output tube

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post #923 of 3414
10/17/12 at 12:27am
Quote:
Originally Posted by 2359glenn View Post

rosgr63s amp with P250 direct heated triodes as drivers RCA 6AS7s and RCA 3DG4.

 

 

rosgr63 amp with 6SN7 as driver RCA 6AS7s and RCA 3DG4

just remove the P250s or LP2s and put in a 6SN7 or 12SN7

has 6 volt or 12 volt switch.

 

What kind transformer are they? I am talking to Mr. Koji at Japan for a pair of Tango. They mark up 23% because the currency exchange!

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post #924 of 3414
10/17/12 at 12:44am
Quote:
Originally Posted by 2359glenn View Post

Actually the driver does more for the SQ then the output tube. The 6SN7 can barley drive a 300B but a10 or a 46 at 1.5 watts can easily drive just about any output tube

 

The #10/#46 driving 300B sounds like a good idea.

 

300B's can start from a low price and end up sky high, but the choice is great.

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post #925 of 3414
10/17/12 at 2:36am
Thread Starter 

Tea for thought~

 

Tube rolling with...a tea kettle? Absolutely! My front-end is currently under evaluation, as I seek to improve the eventual signal the OTL amp feeds on. And the tea kettle has been masterful. I have been trying to find the sweet spot for damping weight atop my Mac mini music server. The kettle weighs 3.5 lbs; the plate it rests on weighs 1.5 lbs.

 

I have determined that spot to be between 2 lbs & 3 lbs appx, with various tube combos. At 1.5 lbs, there's magic in the middle with improvements for Bass just arriving, but not quite there. At 3.5 lbs, the Bass is tighter, quicker but the magic in the middle has begun to depart. So, somewhere in the middle has to be my spot.

 

However, this testing occurred with the footers directly underneath the music server. Now up after hours, experimenting to find out if using a Maple platform or sub-plinth under the server would enhance or detract from the magic in the middle. With rectifiers and drive tubes on deck, this could take awhile. Stability is the main reason to consider using something for balance. 

 

Since a rising tide lifts all boats, I'm sure male vocalists benefit from this tweak too. But I adore female vocals and these brass footers on Maple brought a sweetened tone, texture and finish to their voices that's just lovely.wink.gif Of course, mids are emphasized and depending on one's gear, maybe too much or not enough. But, with my D7000, an improvement. When I compared the midrange from the Denon's to the clear-as-a-bell middle of the HE-6, the difference was astounding! It took nearly a week to readjust back to the Denon's. 

 

LL

 

Oh, but anyway, back to testing...and the iron tea kettle is for testing purposes only, not a permanent addition. 


Edited by Silent One - 10/17/12 at 4:35am
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post #926 of 3414
10/17/12 at 5:43am

If you make me a nice cup of tea, I can come and be a variable test weight!

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post #927 of 3414
10/17/12 at 5:54am
Thread Starter 
Quote:
Originally Posted by rosgr63 View Post

If you make me a nice cup of tea, I can come and be a variable test weight!

 

Happy

 

The overnight session was fun...just went final!


Edited by Silent One - 10/17/12 at 5:57am
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post #928 of 3414
10/17/12 at 5:58am

Like tubes, tea is another addiction for me.

 

What do you prefer HE-6 or D7000?

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post #929 of 3414
10/17/12 at 6:08am
Thread Starter 
Quote:
Originally Posted by rosgr63 View Post

Like tubes, tea is another addiction for me.

 

What do you prefer HE-6 or D7000?

 

Well, I actually prefer my D7000 for all-around cans - does most genres I listen to, better. And I prefer the Bass/Sub Bass notes better on the Denon's. However, I really enjoyed the mid-range on the HE-6 most of the time over the D7000 mid-range. But feel more at home with the other attributes on the Denon. 

 

The HiFiMan's were adequately powered, should anyone wonder. I put them in front of my vintage 1980 Pioneer SX-D7000 and made them work! evil_smiley.gif Quality & quantity...but need to add that, with both auditions, I listened to the Pioneer with all controls flat. May actually enjoy the Bass on the HE-6 next time if I touch up the Bass control on the amp. 

 

 

I tend to drink Jasmine Dragon Pearls (delicate green tea) most of the time. But, I do mix it up, drinking some South African Red tea (Rooibos) or Chinese White teas. Yesterday, it was white tea - Jasmine Silver Needles. What can I find most often inside your tea bowl/cup?


Edited by Silent One - 10/17/12 at 6:20am
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post #930 of 3414
10/17/12 at 11:35am
Quote:
Originally Posted by Seamaster View Post

What kind transformer are they? I am talking to Mr. Koji at Japan for a pair of Tango. They mark up 23% because the currency exchange!

Those what you see are power supply chokes the power transformer is a R-Core mounted flat under the chassis.

The amp is a OTL no output transformers.

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