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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Hi all, Just joined the cat house... funny seeing the mention of some old stomping grounds here... like Bendix in Red Bank, NJ... they were one of my accounts back in the late 70's. As some of you may know, the U.S. Army's electronics center was...
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I once saw a phono stage that used sand diodes, and I have seen an interesting "tank circuit" amp that uses tube diodes +/- like a "buffer". Of recent "popular" amp designs, I have seen a lot of triode PP, but I think this is the first SE pentode I h...
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I did not shoot for the Collectors' Holy Grail to start, but I looked for and bought a +/- "generic" version. The 3.5" I bought are unusual only with respect to their atypical (smaller than the usual 4") cone. They are 88.9 mm, as I recall. Otherwi...
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Thank you for your answer.If I understand well, In purpose to do something realistic and good sounding. I should use at least 2 amplifiers (one for high frequencies and the GM-100 amp for low frequencies) with a tubes active filter at the inputs of e...
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Hi,[quote user="morricab"]Thanks for the info about transformers. It is as I expected, however, that these passive devices are not passive sonically at all. I agree with you that the higher quality of the transformers should lessen the effects ...
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actually I agree with Romy, to a degree.... If the amplifier is a push pull device, using my output and input splitter devices of course, then an interstage transformer is a much better choice than rc coupling. Using transformers designed to the crit...
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I did find replacement tubes OK (online), just not locally, like I had hoped. I have now recieved, installed and tested all new tubes but the 6N6Ps, which have been delayed in St. Petersberg by Christmas mail jamb-up. ...
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As to the best transformers souding more transparent than the best resistors, I'll believe it when I (don't?) hear it. You claim to have heard this but I most certainly haven't. Based on theoretical arguments the noninductive metal film r...
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Romy, that's sort of a feedback I was hoping for, thanks. Ok, I see the point, with the feedback and R3 resistors. The last loads the loop. I have now there 1W Dale RN65D, guess Z-foils with their 0.25W dissipation won't work.
A...
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[quote user="Paul S"]Of course you will give this Grande Dame ('54 - '55 ?) a fair shot with some new parts, apropos? Especially new caps?[/quote]
I would certainly would be very interested if someone with RF knowledge would rebuild the REL ci...
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Paul and Romy,
Thanks for the thoughts...
Romy, you may be right in suggesting that I am "going a little crazy in there" (I consider this a compliment btw)... so for now I decided to try some locally sourced precision metal film resistors (Vis...
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Your response indicates some presumption to me, as much as mine indicated to you. In my experience it is practically NEVER only ONE issue involved -- B U T, one would in my experience try to isolate where the most immediate benefit might be f...
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Well, it seems no matter how hard I try, I am never able to get anyone to think outside the box here. Sort of frustrating.[quote user="Romy the Cat"]For instance the gold plated metal film Holco resistors a few year back were very good and then the q...
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[quote user="morricab"]…. putting the attenuator AFTER the gain stage has negative consequences for the sound….[/quote]
Well, yes and no. In the new 6 channels version of Super Milq I will be use 2 stepped attenuators: for Injection Channel and for ...
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Serenechaos,
You did not mention one another ugly fact the all recommendations about the “quality” of components have any validity in a relatively short distance. It might be no true if we are taking about vintage element but the contemporary produc...
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[quote user="floobydust"] Paul,I suppose that new vs old between the 45 and RE604 could account for some differences, but it's more of an "apples to oranges" comparison. Pushing the 45 beyond it's ratings is not a great idea... especially the cat...
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Hi,[quote user="Romy the Cat"] After some experiments and still being dissatisfied with the HF I ended up consulting with Dima. He spread me a theory according to which the HF was killed by my coupling Silver Mica cap. All my arguments that sil...
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Hi Romy
I have a mono completed full range Melquiades and another only with the bias circuit hooked-up.
The bias voltage I get on the 6e5p is around minus 4.4v on both the circuits. This is with the inputs shorted. With the inputs connected to adj...
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[quote user="Romy the Cat"]
Perrew,I do not know if you use sarcasm in there but Lamm LP2 is not my bellowed phonostage. In fact I am one of the very few people whop do not like it at all. How much in what I do not like in Lamm LP2’s MM section com...
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Ok, you are getting somewhere. I am not sure why I used the 100R, 50R and 22R resistors. It is good idea in some cased to list the potential of some circuits but it need to be used ONLY what it necessary. Do not forget that in your case you have 5 ch...
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[quote user="Romy the Cat"]1) Be very careful with use Halco resistors. They were very good 15 years back but they turned south very aggressively. I bought a party of Halco in 2005 and I forced myself to trashed them as they were very noisy. You...
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[quote user="N-set"]Oh, Romy, I meant the air caps in the corrector loop of course!!!Adjusting PS caps I leave to AA morons and alike.Believe me or not I did go very serious about the proper choke input operation.What I meant is that I have to ge...
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The Rockports have a very light platter and a carbon Arm....the one I listened to was the latest, it had simply no Bass reproduction, nada, nothing and the Arm resonances are also inferior to any energy transfer from any cartridge. The lead wires are...
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Hi,I am slowly building my own Macondo. I understand why the injection channel is there. It brings some kind of softness that the compression drivers lack. I am using a 12" JBL midbass driver (~100dB sensitivity) in a 50L single driver Marshall cabin...
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Do get an RTA, it is amazing how different the frecuencies are from what we imagine, 50 hz is very low! 150 hz is a vital freq, and a lot of female voices have a very nice fullness at 150 hz. It is hard to tell without measuring what is happening ...
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[quote user="anthony"]Thanks for your
thoughts Romy. Last night I roughly wired in some random crossovers….[/quote]I
wrote a loooong replay to you after that post but my 2.5 yo son turned off my computer
while I was posting it. Hate to rewrit...
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[quote user="G"]Should
the grid bias voltage change when I adjust VR1? In my case it does – if I keep
increasing dc on inputs I can get to -1.5v on the grid and around 60v on B+.[/quote]
Nope, it should not, well it is and it is not.
Are you s...
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DA, looks like very nice and lucid assembly. How do you like the sound of the thing? The output stage 200mA /187V. It is a bit too small but I will do. I do not know what the gap you have in your OPT. If it is limited to 200mA then stay there, you ...
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I looked at the schematic for Herb's 300B SET many years ago. It's been copied and slightly modified by many.... personally, I would not use it for a 300B amp... then again I probably wouldn't use it for a 2A3 or 45 either (I think my input/driver d...
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I put the final two layers on the choke and temperately closed the amp up as it will be finally done, laying all cables right and so on. The loaded MF channel now has 0.8mV RMS. So, forget about any noise.
Playing the amp today a...
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