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In the Forum: Melquiades Amplifier
In the Thread: Single-stage Melquiades vs. DHT amps
Post Subject: Single-stage Melquiades vs. DHT ampsPosted by Romy the Cat on: 11/22/2008
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A few days back I posted the following post:

http://www.goodsoundclub.com/GetPost.aspx?PostID=8922

…proposing the parties of interest to play along in Milq vs. DHT competition. This interst derives from the following thread:

http://www.goodsoundclub.com/Forums/ShowPost.aspx?PostID=6317

…where I told that to DHT for Macondo MF channel only might be something that I would try sometime in future.

I have to admit that I a not well-familiar with DHT. I lost my exposed to various amplifiers in 2000 when Lamm ML2.0 entered my room, ML2.0 usually does it to people. I did try something before but then I had a very different criteria then I would have nowadays. Since 2000 I deal with various people and amplifiers who were deep into DHT believing but to the best of my experience with them they did not clearly realized what kind sound I deal with and what audio results I was targeting. This pretty much closed up any door to get any answer for Melquiades vs. DHT inquire and leave the only opportunity to find an answer myself.  I do not want to build DHT and here is where I proposed to open my door for a serious DHT person to make the appraisal of DTH vs. Melquiades sound together.

One, and probably the only one interest that I have in DHT is to research if it possible to get more sophisticated “Absolute Tone” for my MF driver, of the tone from the amp generally.  It is reported by many DH people that DHT from 30s-50s have more interesting tone then IDHT tubes of later production. I personally do not know if it is the case. It might be true or it might be just pure ignorance or Moronity of many DTH builders. I have seen a lot of DHT amps when even a person with very limited technical expertise like me was insulted with absolute idiocy of design decisions.  All those Loftin-Whites with 12AX7 in input, with SRPP in driver stage, with huge cap sitting at driver’s cathode…Please!!!

My primary interest is in 2A3, 45, V52, A2 and few other tubes of that period. I would like also to see a DHT probably, or at least interesting designed and built, most of them are not. My definition of interesting designed would be 2 stages only, with no coupling capacitor (actually, since it will not do bass anyhow I would prefer it to be direct-coupled), with both cathodes on ground. I did not see anybody is trying the DHT like this and it is sad in my view.

BTW, if any of my local New Englanders who might use 2W DSET, wiling to build it and would like to try something “really pushy” then Dima and I came up with a very interesting model of DHT that looks like never was tried.  It is pretty much direct-coupled 2 stages with grounded cathodes… but DC stable. I might divulge the idea and assist with building in exchange for the promise that the build amp will be lent to me for a few days to try how it sound. Let call it the “Real DHT”

I do have my prediction that a single stage 6E6P, in a way how it is done in 6-ch Milq, will overcome any competitive DHT in context of minimum bandwidth of my MF channel.  Tone-wise, however I would not make a prediction as I do not know. DHT might have or might not have a tone advantage but how it might or might not be compromised by the specifics of a given DHT design no one knows. That is why I find the “Real DHT” idea is fascinating it has no capacitors in grid or cathode, and I would say that arguably not even in PS. So, it might be the true methodologically proper test of DHT tone.

The Cat

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