2359glenn | studio

[L0rdGwyn]

It takes a couple of years before they will start leaking. Duelund took 2 years before leaking. Now they discontinued the one with twisted leads.

Time will tell. I am sort of overhauling that amp, going to redo the chassis with better ventilation and remove some voltage dropping resistors, should lower the risk with less heat. Possibly changing power tubes to R120 IDHT depending on how they sound, adding voltage regulators for the 4V drivers, we will see.

 

[leftside]

A great bang for the buck right now for copper caps are the Miflex KPCU series. KPCU-01 are axial, KPCU-02 are radial, 600V. Also came out with a 250V axial version, KPCU-03. They are pretty chunky, but they sound good! About 1/3 the price of the Jupiter copper foil, only $35 a piece for 0.47uF from Sonic Craft. I hope the price lasts, I have these in my 6A5 amp.

http://www.soniccraft.com/product_i...-5312?osCsid=91f66c79e4296776f809475ab9b51707
http://www.soniccraft.com/product_i...uf-600vdc-copper-foil-polypaper-in-oil-p-5291

I think Mischa recommended Miflex for my amp, but I insisted on the Jupiter. I said something along the lines of "I know the Jupiter sounds good in my DAC, so I'm going to stick with those". Might use the Miflex with the next amp...

 

[L0rdGwyn]

I think Mischa recommended Miflex for my amp, but I insisted on the Jupiter. I said something along the lines of "I know the Jupiter sounds good in my DAC, so I'm going to stick with those". Might use the Miflex with the next amp...

Cannot go wrong with Jupiter! Miflex is a nice budget-friendly option. If the build needs big caps, it is often easier to mount radial versions to the chassis with capacitor clamps. Big axial caps can be mounted with zip ties, but it is a hassle :/

 

[Velozity]

A great bang for the buck right now for copper caps are the Miflex KPCU series. KPCU-01 are axial, KPCU-02 are radial, 600V. Also came out with a 250V axial version, KPCU-03. They are pretty chunky, but they sound good! About 1/3 the price of the Jupiter copper foil, only $35 a piece for 0.47uF from Sonic Craft. I hope the price lasts, I have these in my 6A5 amp.

http://www.soniccraft.com/product_i...-5312?osCsid=91f66c79e4296776f809475ab9b51707
http://www.soniccraft.com/product_i...uf-600vdc-copper-foil-polypaper-in-oil-p-5291

Keenan, how do these compare to the Jupiter HT beeswax caps? I need a pair to upgrade the crossovers on my Zu Omen DW speakers. The Jupiters are on sale for $45 for 1uf, and the Miflex is $77. I know you know caps well. Recommendation?

 

[L0rdGwyn]

Keenan, how do these compare to the Jupiter HT beeswax caps? I need a pair to upgrade the crossovers on my Zu Omen DW speakers. The Jupiters are on sale for $45 for 1uf, and the Miflex is $77. I know you know caps well. Recommendation?

Hey @Velozity , I have heard the Jupiter HT Beeswax in a modified Bottlehead S.E.X. amplifier, which as I remember it sounded great! But hard to say as it was some time ago, and not in a speaker crossover. Generally copper foil caps are thought to have a more "natural" sound than aluminum foil, which the Jupiter beeswax are. What I can do is provide a good resource, perhaps you've already seen it, but this is the most comprehensive comparison of available film capacitors on the web from Humble Homemade Hifi, done in passive speaker crossovers.

Capacitor descriptions: http://www.humblehomemadehifi.com/Cap.html
Ratings chart: http://www.humblehomemadehifi.com/download/Humble Homemade Hifi_Cap-Test-Ratings.pdf

Miflex KPCU-01:
"Sound: The Miflex KPCU-01 brings texture to music in a nice organic manner. At times the presentation can be quite tangible. For example on Garry Willis' album Retro it sounds like he has just re-strung his five-string bass. The harmonic overtones of the instrument become more evident making the bass-lines easier to follow. This is not done by artificial emphasis on the top end, it is more "just right". Long term listening sessions are very pleasent which shows that there is nothing artificial about the sound at all - on the contrary. The sound sort of grows on you after a while. Comparing the KPCU-01 to other foil capacitors I found it to be more forward sounding than the both the Duelund CAST Cu and the CAST Cu-Sn and the Jupiter Copper Foil Paper & Wax. In direct comparison the KPCU-01 is a little less transparant in the top end but still rich in tone, smooth and coherent. Although with the Jupiter Copper Foil Paper & Wax music did seem to sound more "complete". A-B switching between the Miflex KPCU-01 and the Duelund RS-Cu revealed that the RS-Cu is more ruler flat neutral of the two but the KPCU-01 did very convincing harmonic overtones. On the other hand, comparing it to the Jantzen Audio Alumen Z-Cap you get a richer tone with more flow and air with the Miflex. Another example: the Mundorf Supreme Classic Silver Gold Oil sounds in direct A-B comparison to have less body and a less natural tonal palette than the Miflex. A very nice capacitor, the KPCU-01.

Verdict: 13+"

Jupiter Condenser HT Beeswax:
"Sound: I found the Jupiter HT BeesWax Paper to be very spatious and rich in harmonic texture. They are clear and open but there is never and over-emphasis on any area. Compared to AmpOhm aluminium foil types the Jupiter has more air and they produce a wider image where as the AmpOhm project more front to back. Still not quite as neutral and coherent sounding as the Duelund VSF but at the same high quality level as the top of the range Mundorf's. They have a nice fleshy treble with a rich midrange to match. They act well under all conditions and don't seem to have any preferences. I find them very pleasing to listen to.

Verdict: 11,5"

As much as one person's ears can be trusted, it would appear the Miflex KPCU-01 come out ahead of the Jupiter HT Beeswax, but a hair behind the Jupiter Copper Foil, which at 1uF are very expensive. I personally would go with copper when practical, which in this case would be the Miflex, but I think you would be very happy with either one, hope that helps!

 

[heliosphann]

What's up everyone! Hope all is well (at least as it can be these days). Finally got my Glenn hooked back up after a long hiatus. Since I don't even intend to sell it, I had it in storage for the last 4-5 months as I was going through all my gear and headphones to sell. Now that most everything is gone (sorry @Zachik, no LAu for you right now) I can get back to listening to my GOTL!!!

Had a strange thing happen today. I was going through all my vintage AKG's I'm planning to sell (look for a big listing in the next few days in the FS forum) and I decided to test some on my GOTL. A good amount of them only have 6.35mm connectors, so I tried to plug them in and the plugs wouldn't go in all the way. Weird. Tried a few other cables and the same result. It's like there's something blocking the jack from fully seating a plug. I very rarely every used the 6.35mm jack (I must have used it before, but I can't say that 100%) as I usually use the 4-pin XLR out.

Any ideas what's causing it? I can't really see anything inside the jack, although it's kind of hard to see inside. Going to try to find a more suitable light.

 

[Zachik]

Now that most everything is gone (sorry @Zachik, no LAu for you right now)

No problem, as long as I am the one to get it when you finally sell...

Any ideas what's causing it?

Belly button lint?
(I wanted to insert a cartoon picture here, but they were mostly disgusting, so thank me later for not doing it...)

I would suggest poking gently with one of those Crochet Hooks (when the amp is OFF): (some are metal and very very skinny so would fit easily in)

 

[Xcalibur255]

What's up everyone! Hope all is well (at least as it can be these days). Finally got my Glenn hooked back up after a long hiatus. Since I don't even intend to sell it, I had it in storage for the last 4-5 months as I was going through all my gear and headphones to sell. Now that most everything is gone (sorry @Zachik, no LAu for you right now) I can get back to listening to my GOTL!!!

Had a strange thing happen today. I was going through all my vintage AKG's I'm planning to sell (look for a big listing in the next few days in the FS forum) and I decided to test some on my GOTL. A good amount of them only have 6.35mm connectors, so I tried to plug them in and the plugs wouldn't go in all the way. Weird. Tried a few other cables and the same result. It's like there's something blocking the jack from fully seating a plug. I very rarely every used the 6.35mm jack (I must have used it before, but I can't say that 100%) as I usually use the 4-pin XLR out.

Any ideas what's causing it? I can't really see anything inside the jack, although it's kind of hard to see inside. Going to try to find a more suitable light.

Some plug styles do this, though I don't know why myself. Eidolic connectors all seem to do it on my 45 which probably has the same connector as your amp.

Don't force it, you'll probably jam and bend the contacts inside. The trick is to apply a slight amount of pressure at the right angle and it'll pop in. You just have to play around with it a bit to find out which direction you need to be "leaning" the plug.

 

[Bonddam]

Almost going to be going through the process of Glenn making me an amp. I spent a lot on tubes for my WA33 now I want to spend less and later decide if more expensive is my route . What are good tubes for rectifier, output, and driver. going to be using this for my Verite and mainly listening to EDM. Trying to go through the thread but I'm getting overwhelmed. I need a base line.

 

[chrisdrop]

Almost going to be going through the process of Glenn making me an amp. I spent a lot on tubes for my WA33 now I want to spend less and later decide if more expensive is my route . What are good tubes for rectifier, output, and driver. going to be using this for my Verite and mainly listening to EDM. Trying to go through the thread but I'm getting overwhelmed. I need a base line.

I am mostly listening with a Verite Closed and also mainly listening to electronic music.

For good tube combos, you certainly review the thread history. There are many, many, .. rolling options.

If I were re-speccing my amp today, I might replace the 6SN7 socket with 2x 6J5 sockets. You would miss on some dual-triodes. If you have a load of 6SN7, etc and want to keep using them, then keep that socket. IMO (and supported by others on the thread), anywhere you use a 6SN7 2x 6J5 is better (or at least as good) and cheaper. These are my main inputs. I do use the c3g sockets, mostly with adapters. I guess you could replace the 6x c3g socket w/ 2x 6J5 but I use the c3g sockets.

This link is quite out of date, but one day scrolling through this thread, I captured some tube recommendations and tube pairings in this sheet.

Output-wise, I am on Bendix 6080s and have not found anything better for me. I have not spent the money on something like GEC 6AS7G or WE 421A tubes (which are crazy expensive right now). I have sometimes used a 2nd pair of other-brand 6080 tubes with a pair of Bendix 6080 (2x Bendix does not work well for me and it is hot hot hot). The 6x 6BX7 output didn't really work for me, but I only have 1 set. 6x 6BL7 I like OK, but not compared to the Bendix.

In closing, if I needed one set to minimise tube cost, with the Glenn OTL, I'd pick the 6080s mentioned and a pair of GEC 6J5s. For me that requires/includes an adapter (from @Deyan) for 2x 6J5 > 6SN7 socket (which would be the default case for most Glenn OTL amps I believe).

On another note, @Deyan has just completed 2 more pairs of adapters for tubes I have in the cupboard. New rolls soon!

Listening to just now...

 

[Monsterzero]

My fav roll for the VC is:

GEC L63 or Sylvania or KenRad 6/12J5
6x 6BX7s (i have the Bendix 6080s,will have to try them again)
GEC U18/20 rectifier

 

[NickT23]

My fav roll for the VC is:

GEC L63 or Sylvania or KenRad 6/12J5
6x 6BX7s (i have the Bendix 6080s,will have to try them again)
GEC U18/20 rectifier

What about the VO ?

 

[Monsterzero]

What about the VO ?

I literally havent touched the VO once since getting the VC.
I mentioned in my VC video review that the VO was quite challenging(for me)to find a perfect roll. The warmer the tubes I rolled in the deeper the staging became. Any time I tried to add brighter tubes to the equation that holographic stage collapsed on me.

I liked the
Tung Sol 6SN7 BGRP
GZ32
RCA 6AS7G
for optimal depth,but it is much too warm sounding for my tastes.

when I tried to roll in 5998s,Bendix 6080 or GEC 6AS7G or Sylvania drivers or GEC U18/20 or even GZ34s the sound had more detail but nowhere near the depth.

 

[NickT23]

I literally havent touched the VO once since getting the VC.
I mentioned in my VC video review that the VO was quite challenging(for me)to find a perfect roll. The warmer the tubes I rolled in the deeper the staging became. Any time I tried to add brighter tubes to the equation that holographic stage collapsed on me.

I liked the
Tung Sol 6SN7 BGRP
GZ32
RCA 6AS7G
for optimal depth,but it is much too warm sounding for my tastes.

when I tried to roll in 5998s,Bendix 6080 or GEC 6AS7G or Sylvania drivers or GEC U18/20 or even GZ34s the sound had more detail but nowhere near the depth.

So with VC for brighter tubes, the holographic stage enhance or collapsed or retained ? What if warmer the tubes you rolled on the VC, does the stage became deeper ?

Does not seems you share much love for the VO than the VC.

 

[Monsterzero]

So with VC for brighter tubes, the holographic stage enhance or collapsed or retained ? What if warmer the tubes you rolled on the VC, does the stage became deeper ?

Does not seems you share much love for the VO than the VC.

The staging on the VC isnt as exaggerated as it on the VO so I didnt find myself chasing that ultra deep sound. Its also worth mentioning that warmer tubes with the VC gives it too much of a thick sound and too much decay for my tastes.
I like the VC to sound fast,tight and snappy and Im getting that(and much more) with the roll I listed above.

The VO used to be favorite headphone prior to the VC,so the fact that i dont listen to the VO anymore isnt really a knock on the VO,rather a testament as to just how great the VC is.
Your mileage may vary and all that jazz.