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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 264

post #3946 of 10758
Quote:
Originally Posted by SwanSong View Post
 

Thanks gibosi,

The opamps I listed are they direct replacements for the stock opamp (1 to1) ?  I read other opamp suggestions required adapters for dual opamp configuration?

These opamps are both about $15 shipped on ebay is that a good price?  The Voshod matched pair i found on Yen audio ebay page for $36 shipped.  The Mullard's I couldnt find on ebay but found elsewhere for $60 shipped and match tested.  I'm just wondering if these are ok prices?

 

In my opinion, paying extra for "matched" tubes for the LD is a waste of money.  Anyway, I have purchased two pairs of Voskhod from this vendor:

 

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130436695928&ssPageName=ADME:L:OC:US:3160

 

one pair for $3 plus $12 shipping, or $15. (Oh I see that Superdux beat me to it! :)

 

Instead of the M8161/CV401, what you really want is the M8161/CV4015. I think someone made a mistake in their typing and left off the 5..... 

post #3947 of 10758
Thanks Edgard & superdux, I'll check on the freebie opamp for sure and the Voshkod combo first. I love the rocket sound in my dac I'm guessing the opamp should warm it up a bit?
post #3948 of 10758
Thanks any suggestions where to buy M8161?
post #3949 of 10758
Quote:
Originally Posted by SwanSong View Post

Thanks any suggestions where to buy M8161?

The M8161s seem really hard to find, at least for me, I only found one seller, and he seems to be only selling one. 

http://www.ebay.com/itm/Vintage-58-Mullard-M8161-CV4015-tube-Horseshoe-getter-superb-condition-EF92-/380574433134?pt=Vintage_Electronics_R2&hash=item589c00ff6e

 

$15 for the tube, and $10 for shipping. 


Edited by Sony Slave - 11/11/13 at 3:51pm
post #3950 of 10758
Quote:
Originally Posted by Sony Slave View Post

The M8161s seem really hard to find, at least for me, I only found one seller, and he seems to be only selling one. 
http://www.ebay.com/itm/Vintage-58-Mullard-M8161-CV4015-tube-Horseshoe-getter-superb-condition-EF92-/380574433134?pt=Vintage_Electronics_R2&hash=item589c00ff6e
I sent an email to this seller requesting two but no word yet. I found another on the web but it's $26 ea plus shipping + match testing about $60 total
post #3951 of 10758
Quote:
Originally Posted by Anaximandros View Post
 

Hi Artsi,

 

can you do a wiring diagramm for your 6SN7 to 6N6P tube like you did with the 6DJ8 adaptor?

 

Before making only the box for the 6DJ8 tube I want to integrate the adaptors for the octal powertubes. This box will be made of ebony wood and I don't have enough for 2 boxes :(

 

Thanks

Here is wirings for one channel B9A to Octal for 6SN7 as powertube. Remember are you looking socket from top or bottom.

post #3952 of 10758
After all this I just noticed the HE-500's 38ohm recommend 1w power and the LD1+ only has 800ma @ 32omh. Suggestions anyone??
post #3953 of 10758
Thank you very much Artsi.
How would you compare the difference between the 6SN7 and 6N6P as powertubes?
post #3954 of 10758
Quote:
Originally Posted by Anaximandros View Post

Thank you very much Artsi.
How would you compare the difference between the 6SN7 and 6N6P as powertubes?

I can't compare differences between 6N6P-IR and 6N8S directly, because can't use same driver for both of them.

With octals there is better music flow, smoother sound with excellent instrument separation. And everything sounds more present.

After octals the combination of 6N6P-IR and 12AZ7A sounds little harsh and could there be even some distortion.

 

I'm waiting impatient for more octals to listen. Hope to get those last week ordered tubes tomorrow.:popcorn:

I managed to won auction of 3 KEN-RAD 6SL7GT's with three different plates. I think those KEN-RAD's are made in 40's or early 50's.

 

Nowadays it seems that even deaf people can make music:

aargh my ears! How could bass drum sound like that! Where is dynamic? Why everything is just same flat distortion.

 

But there is a cure. Me and my octals like.

 


Edited by Artsi - 11/12/13 at 12:52am
post #3955 of 10758
Quote:
Originally Posted by SwanSong View Post

After all this I just noticed the HE-500's 38ohm recommend 1w power and the LD1+ only has 800ma @ 32omh. Suggestions anyone??

If my calculations were right with 89dB/mW sensitivity you get around 119dB with 1000mW. Is 119dB your normal listening volume? Hope not, or you become deaf soon.

post #3956 of 10758
Quote:
Originally Posted by mordy View Post
 

What makes the 6SN7 into power tubes over the 6SL7 tubes? Can they be used reversely?

 

6SN7 has gain 20, which is about the same as 6N6P. 6SL7 gain is 70. 6SN7 delivers more watts.

 

Of course 6SL7 could be used as powertube, but my experience is that you lose power and dynamic.

post #3957 of 10758
Quote:
Originally Posted by Artsi View Post

If my calculations were right with 89dB/mW sensitivity you get around 119dB with 1000mW. Is 119dB your normal listening volume? Hope not, or you become deaf soon.
Thanks Artsi I don't have a clue regarding these power/sensitivity ratings. I would much rather spend $250 on a maxed out LD1 vs $500 and up for the other amps. And I really like the look of the LD amps and size for my desktop.
post #3958 of 10758

Those 6J1P-EV Voshkods are good choice, even if they are not military grade like mine aren't.. You really can't go wrong with that price.

post #3959 of 10758
Quote:
Originally Posted by SwanSong View Post

Thanks any suggestions where to buy M8161?
I have a pair thatbi would sell. Pm me an offer shipping is from Canada
post #3960 of 10758
Quote:
Originally Posted by Audiofanboy View Post
 

 

Lol, it's like you read my mind; I'm building my two adapters with the exact same plan in mind! Hopefully, a switch between triode sections every, say, 20-50 hours could save all four triodes from cathode poisoning (and from losing their rather high resell value) and make the "two double triodes with only one section used' solution more appealing and less wasteful.

 

Glad your first adapter worked on you first try. I've had times in the past when I got too excited and drowned a freshly made DIY adapter in hot glue before testing, and had a bad surprise a few minutes later, so now I'm extra careful about that...

 

I'm trying to make adapters that are even a bit smaller and thinner than yours though, like no more than 1.25cm or 1/2" high and with with narrowed B9A sockets. I'll take a picture when I'm done -if I ever manage to be lol...

 

As an extension to the 2 differently-wired adapters, I got to thinking - if we double up on them, with just 2 tubes we have 4 possible combinations of individual triodes; with 3 tubes, 12; and with 4 tubes 16!! Given that unless we have balanced dual triode tubes, they could possibly be a tad out of balance...thus with the option of multiple combinations we must eventually hit on a magical pairing...just a thought...

 

The Voskhod 6N2P-ERs now have 40+ hours on them, and thankfully the bass is developing VERY nicely...not quite the punch of the RCA 6DJ8s, but with more articulation - assisted perhaps by the greater soundstage and overall clarity. The separation and spatial character of these tubes - on my gear - is amazing. The more closed-in nature of the RCAs (which I believe can be a slight tendency of the Amperexes, unless you can afford the top-flight versions) has me preferring the Voskhods. It will be interesting to see how some TFK ECC88s compare in due course...

 

Edit.

ps. Forgot to mention. The detail from these is also quite stunning...and considering they can be found for $4.50 ea, they represent amazing value-for-money...


Edited by hypnos1 - 11/12/13 at 1:29pm
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