|
|
| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
|
|
 |
|
|
|
|
|
Yes, it is a bit confusing, as I meant to say that it will be a half of capacitance, I said it twice and it looks unclear. Still anybody understands how series capacitance works. BTW, it was a standard practice in before 70, before industry made by-p...
|
|
[quote user="Romy the Cat"] The major minor thing remains to find different lower bass. I said “minor” thing as my lower bass is not bad, in fact I do insist that it is very proper lower bass as I did set it up lately properly…..Despite that I in...
|
|
KOTriode, I got a feeling that your unfortunate experience with the few presumably bad tubes that and your former experience with DHT tubes made you to treat the 6C33C as it is some kind of fragile princess. Filament burned for more than 20 hrs befor...
|
|
Reading you guys I can hardly imagine how you can use this amp at all going trough the hassle with the tubes and bias.This amp needs to be monitored and pampered constantly and getting tha thing to work seems to be ceremony on it's own . How do...
|
|
Vp = 240v, Vg = -90v, Ip = 165 ma, RL=1k5, 10W, H2 = 6.9%, H3=1%, H4=0.2% I used it with cathode bias (used 50w resitor, backed by 10x200uF capacitor). How it sounded - warm and punchy. I had an amp with F-3 about ...
|
|
"Indeed for classical work I often find a slightly under damped bass response to be emotionally evocative and of benefit to the illusion of the acoustic"Have you looked at the primary cause of this issue with most SET amps? I can tell you that ...
|
|
I like having a center-tapped filament winding for flexibility. First, you can use a traditional approach on hum balance (what you have now) or use a slightly different approach. I use the center-tap as a fixed DC balance (cathode bias resistor solo...
|
|
As I've mentioned elsewhere before, over the years I've gotten about 25% clinkers, among all tubes, from all sources, including "specially selected, graded and matched" tubes. Also, I have lived with the 6C33C enough to say it "drifts" in use, and i...
|
|
Thank you JD for all the information. It was most helpfull. I will get the amps in the original crates, the instructions manual anf a few sets replacement tubes. Do you know the physical size of the fuses?. Seems like I have to buy some. I have alrea...
|
|
Well 10k PS and 700V out ought to do it for headphones, all right (!), and the chokes ought to crank enough EMF to stand your hair on end at ten paces.Not sure why you need to fight DC, but...I already told of my own preference for bias adjustment op...
|
|
Wojtek, in reality all “problems” that you picked from Paul’s comments are purely inventions of his mind. ML2 is truly “turn and forget” type of amp and it requires no dancing or prying around it. The 6C33C requires some attention when it is new but ...
|
|
How can we compare anything if we know from the very first note what media is being used? The noise floor and sonic artifacts are unique to each media, so are we talking about confirmation bias? Let us assume that we have a first generation analog ma...
|
|
The annoying thing is that a big, odd-shaped, high-ceilinged room with openings might take a LOT of power before the room gets sufficiently charged in the orchestra's "power band". Just looking at the room, this might take 600 Wpc as soon as 60 Wpc,...
|
|
[quote user="clarkjohnsen"] A person who has good sounding power lines? Never met one such! I can't help but think, however, that turntables should employ batteries.[/quote] The PP2000 dose convert power lines into good sounding power lines, so what?...
|
|
N-set, I am not the one to double check your mathematical solutions, that's for sure. I wonder if in practice the curve values here are effectively tied to variables? I like the Chimera idea, but it has no "locked curves" to contend with, and it us...
|
|
N-set, have another look at the Chimera "bias", and the sophistocated way the diodes effectively buffer the gain stages, also the way the caps are staged over the tiered ground planes. Also check where the Ls are with respect to the signal. Perhaps...
|
|
The second stage switched to fixed bias
...
|
|
Man would I love to visit the MIT fleamarket... only a few thou miles away alas.Well, I'm not advocating A2 in any way. The 13E1 will happily run at lower anode voltages but you won't get enough A1 power out, which is a shame cos you'll need a new po...
|
|
This post is a derivation from the following post:
http://www.romythecat.com/Forums/ShowPost.aspx?postID=11797#11797
What is interesting is that I have a few the same types of shields for small 7 pin gas tubes and I have tried tho...
|
|
Ok, the Milq MF DSET is well laid out. I have ordered a few parts and it will be on it’s way. I’m still contemplating what kind 400V cap to put right before the DHT tube in B+. I have space and I might go do film cap but I am not sure. Still ...
|
|
[quote user="jessie.dazzle"]Since renewing all tubes in both ML2s, over the period of about 3-5 minutes, the V2 bias on one of the amps cylcles between .27 and .33VDC. Is this behavior indicitive of a defective 6C33C?[/quote] That is not good. Try to...
|
|
Building the Melquiades: #3
Spent last might 3 more hours to pile up in one of the Melq the rest of the parts. It looks like now all detachable parts are there. Whatever parts have no assess anymore are wired and the main ground is in place. Pretty ...
|
|
Hello,Here's an idea - uses a resistor in series with a current source on the negative supply to drop the voltage to the 6c33. Not sure how happy (sonically) the 6C33 will be with a 50k resistor on its grid. It would be huge problem at HF a...
|
|
Pretty clean, Romy (and one hellova tranny at Fundamentals)!Of course, I have questions:I thought you said Vishay metal foils in your earlier response about bias adjustment?If so does that mean steps, or... how, exactly?When you specify "Full" ...
|
|
N-set, I am sure you realize by now that I do not properly understand "electronics". I see the "diodes" in the Chimera circuit as a sort of "active" bias that is also dynamic proof against blowback/ripple to and from the tank, at each of three "...
|
|
Some people bias 833 at 0V. Some in A1 but to get teh stated powerit must go into A2. Do you or anyone have normal plate curves for 833 instead of that multiampidiocy usually published? Say up to 200mA. Same for 304tl.Outpur tranny--this is the funct...
|
|
Well, one way or another I will fix my B2 amp. I think while I have no bass amp it would be a good idea to try other amps for ULF: powerful tube amps or even class D amps. I do not have inspiration to dry Class D amps and I have no powerful tube amp...
|
|
[quote user="Paul S"] I have stated several times that the ML2s are less sensitive to bad electricity than my phono stage, and this is true. However, this is not to say that the amps are immune to bad electricity. In fact, it is the effects of bad el...
|
|
Well, since I will not experiment with many of them I'm kind of narrowing down the scope of the amps that I would like to get. In 70s-80s break there was a short period of time when Yamaha and Sony made top of the line amps around V-FET output t...
|
|
Jim, I have sent you the tubes – it might be an interesting journey.
I send you:
1) 6C33C that was working with both cathodes approximately a year. It is not dead year but it is deep into retirement age. Run it at 220V and 200-250mA full-tube,...
|
|
|
|
|
All context of this site except the Forum's posts
Copyright © Roman Bessnow 2004-2024
All messages within the Site’s Forum Copyright © by
authors of the posts
|
|
Last 24-hours posts: |
0 |
|
 |
|
|
Total human visitors: |
42,848,038 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Lawes, William (1 May 1602»
|
|
Arditi, Luigi (22 July 182»
|
|
Vilem, Blodek (3 October 1»
|
|
Dvořák, Anton»
|
|
Alfvén, Hugo (1 May 1»
|
|
Sowerby, Leo (1 May 1895-7»
|
|
Weyrauch, Johannes (20 Feb»
|
|
Leifs, Jón (1 May 189»
|
|
Whitlock, Percy (1 June 19»
|
|
Khachaturian, Aram Ilyich »
|
|
|
|
|
|
|