[mordy]

Anyone have an idea as to who made these?

The most likely manufacturer is Sylvania.

 

[DecentLevi]

You know what the worst (and best) part of waiting for a Glenn amp is? Every month that goes by, I think, "hmm, maybe I want X upgrade too. Oooh, might as well get Y upgrade as well". So the longer I wait, the more expensive my GOTL is getting! It's gone from $1300, to $1500, to $1600, and now I'm debating whether or not I want to go full Yamamoto sockets. Send help.

How ironic! Another (upcoming) Glenn amp owner also in Seattle (correct me if I'm wrong). I would be interested to see how the sound of your GOTL compares to my upcoming GOTC (custom transformer-coupled SET OTL) amp. Curious when is the general timeframe for your amp?

I was told around Christmas time for my amp. @2359glenn that would be cool to know how the general timeframe is lookin'? (Feel free to reply by PM instead). Sooner is better but take care of yourself first.

 

[DecentLevi]

I'm very glad to read of your early impressions of the cable. Keep burning it in, things are going to continue to improve over the next hundred hours or so.

I may be able to organize a tour like i did with the Amber, but will need at least a couple of weeks before I'm ready for that as we're trying to keep up with the holiday demand.

Thanks for the interest, guys!

Fred

Count me in for the USB cable tour, if possible. I'm not (yet) a believer in USB cable differences, but that must have been what I said about RCA cables a long time back, LOL. Are those also made / distributed by Lampizator?

Also a burning question I've had about the Amber 3. Which DAC chip does it use, and are there multiples in parallel? And how would one characterize the sound vs. An R2R DAC? Because that has been my ideal preference for an analogue lifelike sound - but it still needs to do rhythm / PRaT well. A little off-topic so feel free to quote me on the appropriate thread for it.

 

[Monsterzero]

Count me in for the USB cable tour, if possible. I'm not (yet) a believer in USB cable differences, but that must have been what I said about RCA cables a long time back, LOL. Are those also made / distributed by Lampizator?

No. Theyre made by Final Touch Audio, though many Lampi owners use it,and I can hear why.

I got the text tonight unfortunately,and Fred needs his cable back,so I pulled it and re-inserted my other USB cables. Everything sounds congested in comparison. Theres so much more separation and space in between the instruments with the Callisto.

To clarify my previous comments about the midbass being less pronounced...Its not the Callisto. The midbass is still not as powerful as prior with my old USB cables in place,so now my focus is on my new RCA cables. Fortunately for me I received a box of cables to check out from Atelier 1 down in Nashville. Three different RCAs,a power cable that costs a kidney,and a new gizmo that is intended to replace power conditioners(also comes with a kidney price tag).
The next two weeks I will be rolling various cables and listening for improvements,or otherwise.
Constantin is a great,gregarious guy. I even convinced him to buy some Sextetts
Frankly I would never have spent triple digits on a damn USB cable,but getting the chance to plug it into my system and hear for myself what comes with the price has made me a believer.

Also a burning question I've had about the Amber 3. Which DAC chip does it use, and are there multiples in parallel? And how would one characterize the sound vs. An R2R DAC? Because that has been my ideal preference for an analogue lifelike sound - but it still needs to do rhythm / PRaT well. A little off-topic so feel free to quote me on the appropriate thread for it.

I havent heard the Amber 3 personally,even though I helped get the tour going,but my TRP vs. an R2R is no contest. Again more air,space,wider staging,better PRaT,smoother,simply better everything. My previous R2R DAC was the airiest,cleanest,brightest,best R2R DAC I've heard,but in comparison to the TRP it sounds muffled and congested. Gopher maintains the Amber can hold its own vs. the TRP,so take that for what its worth.

 

[carlman14]

How ironic! Another (upcoming) Glenn amp owner also in Seattle (correct me if I'm wrong). I would be interested to see how the sound of your GOTL compares to my upcoming GOTC (custom transformer-coupled SET OTL) amp. Curious when is the general timeframe for your amp?

I was told around Christmas time for my amp. @2359glenn that would be cool to know how the general timeframe is lookin'? (Feel free to reply by PM instead). Sooner is better but take care of yourself first.

Another Seattleite waiting on a glenn amp? What are the odds. I would be curious about a comparison too. I wouldn't mind doing a mini meetup with you once we both have our glenn amps! Originally I was told fall of this year, but was recently told it will be a bit later than that. No specifics were given. Waiting is killing me but that's ok. Can't rush the master.

 

[Xcalibur255]

The best Mullards cost an arm and a leg. The RCA are great though. See if you can find the late 40's with D getter and long black plates. These should compliment the Tele's quite nicely. The RCA are definitely on the warmer side. I consider 1960's Mullards also to be on the warmer side. The mid-1950's (the "arm and a leg ones") I find more neutral/revealing with only a hint of warmth. Early Valvo and Amperex are also meant to be very good, but again earliest = "arm and a leg". Brent Jessee gives a great description of these tubes and variations on his site.
http://www.audiotubes.com/12ax7.htm

I have some RCA 5751 triple mica, long black plate arriving next week. 5 pack NOS/NIB with RCA 5 pack holder from another guy in Canada. From Brent's site:
"5751: This version was usually the one made for the US military. These have a lower gain than the 12AX7, but are otherwise totally compatible. Great hi-fi tubes, as the lower gain reduces noise and microphonics. These are all ruggedized and most can withstand a drop on the floor. The internal triode elements are matched as well. The early versions are more sought after as they usually have extra support rods and an extra mica spacer on top of the plate structure ("Triple Mica"), as well as blackplates, all said to contribute to low microphonics. Don't overlook the greyplate versions, they are also excellent tubes, and many of these have the triple mica as well. The GE non-military version is usually the "five star" series, intended for broadcast use. The RCA broadcast type is the "Command" series. Both the RCA and GE broadcast types are scarce, as are any of the triple mica types."

I also run the Raytheon 5751 windmill getter in the line stage of my preamp, which I like a lot. Not exactly "cheap", but about half the price of some of the other so called "top tier" European tubes.

I run 1960's Telefunken 12ax7 in the phono stage.

As you can see from above, the 12ax7 tube rabbit hole is about the deepest tube rabbit hole out there

I hunted down a true NOS pair of Sylvania Gold Brand 5751 for my Luxman. It was a MASSIVE improvement over the stock JJs. I was going to get some Raytheon windmills too but I'm so happy with the GBs I just called it a day right then and there on the subject.

Now if only I could try a different set of EL84s. Every time I try the amp red plates the new tubes, but when the stock JJs are in the thing runs fine.

 

[whirlwind]

I had a Sylvania 5751 triple mica black plate that was my favorite tube in my MadEar+HD

I miss that amp, but you can't keep them all.

 

[L0rdGwyn]

Finally got rid of those annoying XLR inputs, switched them out for some very nice RCA jacks today. I replaced the entire back panel, IEC inlet, cut new holes for the mutlivolt switch, RCA jacks, along with new tapped screw holes for the filament rectifier (was happy to redo this since I made a cosmetic mistake last time). Overall, a great success! Not a dramatic change in sound obviously, but it looks nice and I don't have to use XLR to RCA adapters!

 

[Monsterzero]

Finally got rid of those annoying XLR inputs, switched them out for some very nice RCA jacks today. I replaced the entire back panel, IEC inlet, cut new holes for the mutlivolt switch, RCA jacks, along with new tapped screw holes for the filament rectifier (was happy to redo this since I made a cosmetic mistake last time). Overall, a great success! Not a dramatic change in sound obviously, but it looks nice and I don't have to use XLR to RCA adapters!

Just so you know Keenan,im highly impressed! Well done!

 

[DecentLevi]

6 pack of GAS7G/6080:

I bought the Triad 20 amp 6.3 volt transformer (again) and am awaiting parts needed to make a wooden box that will be the same depth as the GOTL. Going to "dock" the box to the right of the GOTL and power the 6x power tube heaters via the external transformer. Have it jerry-rigged now to heat 2x power tubes and have been enjoying 4x 6080 and 2x GEC 6AS7G ( generously on loan to me from @GDuss ).

4 more socket savers that bring pins 7/8 out to externally heat the tubes have been ordered from Mrs Xu (she gave me a great price on 4):
https://www.ebay.com/itm/191741357847

I love what I am getting! The lows and lower mids are tremendously intimate. The photo shows a TS 12SN7 mouse ears driver. I have since switched to the 75+ year old NOS 12J5 Tung Sol's and the intimacy is extended through the mids. Better separation, wider sound stage, too.

I have "Pipe Organ" bass - like it is vibrating the floor and chair I am sitting in. This is an illusion, of course, but man...it is FUN!





When I get the box made and am powering all 6 power tube heaters externally, an added benefit will be the GOTL running very cool since it won't need to provide the amperage to the power tube heaters.

That seems interesting. Why are you setting up to externally heat tubes with the GOTL - just to reduce transformer temperature, or to try special or larger combinations that were not otherwise possible?

Being a long time user of your first Triad 20ah externally heated transfo. on my Euforia, I'll point out a few things. Do remember transfo. burn in takes a long time (even after you gave it to me) and the sound can improve much after... say 200 hours perhaps, otherwise it may sound thin. Also although I'm satisfied with the 6x adapter board from Ms. Xuling, I would advise going with something of higher quality materials. Its' PCB does seems to use some sort of silver conductor, however I'm pretty sure she uses brass pins and copper sockets. Someone on the Euforia thread reported noticeable improvement from quality of conductors of an adapter, and especially when you're using that many tubes and on such a resolving amp as a GOTL, quality conductors will be more advantageous / noticeable.

 

[L0rdGwyn]

Just so you know Keenan,im highly impressed! Well done!

Thanks! Much appreciated I almost passed on this amp, so happy I didn't and I've been able to make it my own, gotta keep these idle hands busy.

 

[2359glenn]

Finally got rid of those annoying XLR inputs, switched them out for some very nice RCA jacks today. I replaced the entire back panel, IEC inlet, cut new holes for the mutlivolt switch, RCA jacks, along with new tapped screw holes for the filament rectifier (was happy to redo this since I made a cosmetic mistake last time). Overall, a great success! Not a dramatic change in sound obviously, but it looks nice and I don't have to use XLR to RCA adapters!

Nice job

 

[mordy]

Having fun combing through the eBay bargain bins for ugly little black metal tubes in the 6C5 and 6J5 families. Some of them are rusty or the black paint is flaking off here and there. If you buy them in small lots the cost usually is less than $2-3 each shipped.

As bad as these tubes look, that's how good they sound. I would not be surprised if I end up liking these better than their straight glass and Shoulder Type glass counterparts.

Here is an example of an unrestored Sylvania 6J5 tube. It must be quite old because it has the flashing S symbol on a green oak leaf.

Not sure how to date it - S I probably doesn't mean Staten Island, NYC since I don't think they had a factory there. Some tubes used the word O-P-U-S to designate the quarter of the year. S would then mean the 4th quarter.
"I" could mean 1951 - not sure of these assumptions.
On the other hand there are clearly the letters DL printed on the tube. Cannot find any chart that has those letters - maybe this tube came from DL's (Decent Levi) collection, but how did it end up in Council Bluffs, IA, where the seller resides?
You have to give credit to these tubes - they do not need too much packing material - the lot of six tubes was shipped together in a plastic sandwich bag packed inside a thin breakfast crackers box with some newspaper wrap.
BTW, the seller states that he has 20,000 tubes sitting in a locker - only a few are listed so far.
Another adventurous tube rolling day .....

 

[mordy]

Finally got rid of those annoying XLR inputs, switched them out for some very nice RCA jacks today. I replaced the entire back panel, IEC inlet, cut new holes for the mutlivolt switch, RCA jacks, along with new tapped screw holes for the filament rectifier (was happy to redo this since I made a cosmetic mistake last time). Overall, a great success! Not a dramatic change in sound obviously, but it looks nice and I don't have to use XLR to RCA adapters!

Hi LG,
Very impressive work! - my GOTL has two sets of RCA plugs; line in and preamp out.

 

[JazzVinyl]

Finally got rid of those annoying XLR inputs, switched them out for some very nice RCA jacks today. I replaced the entire back panel, IEC inlet, cut new holes for the mutlivolt switch, RCA jacks, along with new tapped screw holes for the filament rectifier (was happy to redo this since I made a cosmetic mistake last time). Overall, a great success! Not a dramatic change in sound obviously, but it looks nice and I don't have to use XLR to RCA adapters!

I agree! Well done, indeed!!!