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In Reply to: RE: another commentary... posted by commentary on April 28, 2012 at 00:27:58
I have always had a simplistic view of thermonic devices compared to their SS brothers. The valve amplifier simply provides Harmonic distortion closer to the root than other methods of amplification.
Triodes, off the shelf, are more linear and Pentodes can be tamed to provide a marvelous sound with a little feedback particularly if the feedback is limited to the output section.
SE and PP are a matter of taste. I use both because I like both.
No argument is needed. Everyone has their own ears. You can't convince someone of anything with measurements.
I saw the photo of one of your 50 monos. I was wondering if you tell a little about them and if you have a photo you could post of both of them in action. Thanks. BTW they look great my friend !
These amps started as 45s. Because my speakers are not quite efficient enough to really let he magic out, I found some 50s to play with. I was starting up a foods plant and had some over time money in my pocket at the time...they were a bit pricey...
All of the power iron is Hammond while the audio transformers are all Lundahl. Kevin at K&K had a couple of rev A LL1692a Interstage trannys that he let me have cheaper because they had a weird pin out.The output iron is a couple of LL1663 gaped for 50 mA. One mono is AC heated and one is DC heated. I did this so I could compare the sound while I tweeked the DC supply...worked well.I'm running the 50s gently at around 50mA and 380 VDC on the plates. I'm driving the ITs with a single 5842/417a..amazing little tube. The 50s really have a special sound..glorious mids, good thump and sweet high end.I have used these puppies as a reference for my other projects. (other amps in the picture)...
What rectifier are you using ? Thanks.
I worked with many but the Mullard variants are the best.
When you're working with such a simple circuit, the rectifier has a serious influence on the sound...you can definitely hear the rectifier.
Thanks for the photos and the scoop on them. Wonderful system ! The amps are beautiful and I am sure you must be pleased. I noticed the EML put out a 50 not long ago but PRICEY ! I wish I was more of a diy guy so maybe I will have someone build me a pair down the road. Thanks again for the photo and info my friend.
My non work e-mail address is email@example.com.
Thanks Stuben. Mighty nice of you. Would be real nice to have a pair. At the moment I am running a type 46 tube amp which is incredible.
BTW what rectifier tube are you using ?
I tried a few and Ultimately the Mullard GZ34 was my choice. I run this rectifier in all of my amps. Expensive, but with simple designs, the rectifier has a real influence on the presentation.
Nice amps !!
You just gotta love the sound of 50's, puts a 300B to shame...
Thanks...We had a DIY get together at my place a few years ago and I think it was Larry Moore who said " A 50 is what a 300B wants to be" :> )
They are hard to come by... I have (2) spare globe 50s. I have heard that Shuguang makes a new stock 50, I haven't seen any around though.
Cool shot. I just put up this one on my blog and still love the two below by F stop schroder.
and finally a picture of a dead soldier properly laid to rest.
Recently Released EML 50. See the photo above and link below. Their 45, 2A3 and 300B are excellent, so I would imagine the 50 is too.
Thanks..very cool..more flexibility in the future. I had considered installing some different OPT and filament trannys and changing the amps to 2a3s because of the 50s becoming silly rare...
Could you give more details on your amp? A schematic or a link to a site would be nice. I have a few globe 50's I would like to try.
All of my schematics are in Visio. I will pdf and get you a copy.
I've tweeked this schematic several times. The regulator on C+ especially.
The LL1692 wire with all of the primaries in series and the secondaries in series.
If it sounds good it is good. Little else matters.
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