2359glenn | studio

[MoatsArt]

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[MoatsArt]

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[MoatsArt]

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[rosgr63]

Happy Easter

 

[MoatsArt]

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[rosgr63]

Enjoy it Nathan.
 
Don't worry, Glenn will build you the beast amp for your budget.

 

[gibosi]

On the chance that some of you might be interested in my progress as I continue to learn how to get the best sound out of my Glenn OTL...
 
I use a DAC/pre-amp (Audio-gd Fun) in front of the OTL. On a hunch, to take advantage of the increased gain of the 5998 in the 5998 mode, I turned the OTL volume down to below 20% and the volume of the pre-amp up above 80%. This reduces the hum down to the point that it is about the same as running 6AS7 and 6080. In other words, I can now enjoy and appreciate 5998, properly biased. Nice!
 
On another note, I continue to enjoy the Lorenz C3g. I have only taken them out for a short time to test a recent arrival, an NU 6F8G, and then popped them right back in.
 
And I want to say publicly, I think Glenn deserves a medal for his patience as I and all the other noobs slowly figure out what we are doing... 

 

[Ultrainferno]

  I'm doing another group buy for the Lafigaro 339 guys, this time its RCA branded, Tung-Sol made 6SJ7(wgt) tubes with the rare mesh plates.
I have done the exact same one last year already
 

 

 
5 pairs are already reserved for the new sale. A pair is 80€ (+shipping)
 
Let me know if anyone wants a pair, I'll contact my seller in a few days.

 
I'll be getting them on tuesday, please send a PM if you want some.

 

[Neogeo333]

I think it's natural for some of us that have gone through that uncertain phase when choosing an amp.   Unless you have years of experience and know exactly what you want it's better to leave it to the expert and follow his/her recommendation.   My first two amp where good but then I didn't know better and could definitely get better bang per bucks going another route.   
 
Don't worry Nathan I'm sure Glenn will build  you a monster amp.   The most difficult part is the wait.   Which leave you time to hunt for tubes.   

 

[Clayton SF]

  Happy Easter, Stavros!  We are enjoying our Easter Sunday evening meal at the moment (break between courses).

HAPPY EASTER. I'm dying some eggs. I know. A bit late, but Easter isn't over yet.

 

[Xcalibur255]

  I have time to ponder at the moment, and I have been doing alot of pondering about my OTL. 
 
My thoughts turn to a DHT OTL headphone amp.  Looking at a few datasheets, it seems as though the transconductance of the 45 puts it out of contention unless (assuming using them in parallel increases transconductance - is this right?) I put a lot in parallel.  Price would rule this out.  This leaves the 300B and 2A3 as possibilities.  Perhaps two in parallel per channel would do the trick.  Would a single C3G per channel be enough to drive these?  Are there other DHT tube possibilities (need to be current production or readily available NOS)?  Anyone tried DHT in OTL before?
 
Thanks
 
Nathan

 
Glenn's personal OTL amp he built for his own use years ago is a parallel 2A3 design.  What you're thinking is certainly possible.  The downside:  the output impedance is high enough that driving low impedance headphones is really not possible with this setup, so you would be limiting yourself to the HD800, T1 and other high Z phones only.  Basically the opposite problem from what I have with Kanade (my 45 DHT amp).

 

[MoatsArt]

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[parbaked]

  Cool - I want an amp that is optimised for T1s and HD800 and don't care about anything else.  

Then you might not even need the 5998 switch.
You can spend the savings on tubes and pizza...

 

[MoatsArt]

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[Xcalibur255]

  Kanade is an OPT amp, isn't it?
 
Warm regards
 
Nathan

Yes it is.  All transformers are Lundahl.  I think my one regret was not going for amorphous core OPTs, but I was really push the limits of what I could afford as it was so I drew a line in the sand.  I regret it a little now, since doing a custom amp like this is kind of once in a lifetime thing in my mind.  Sometimes I feel like I can "hear" the transformers just a little which is a testament to how incredibly transparent the design is.  The manual bias adjustment and full wave bridge rectification design both contribute to that.  This is why it's been a challenge to find genuinely good 45 tubes, the amp is brutally revealing of the quality of the tubes it has running in it.