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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I would like to expense a bit on my post above. If we presume that a warmed up, hot magnet (electromagnet) radiate a magnetic field of different type and those “hot filed” have some kind of positive effect to sound then there is a possibility of mode...
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Hello chaps,Firstly, something I forgot before was that the high impedance coil will have more turns... so the DCR etc will be stepped down as seen by the voice coil. My guess is that overall it will still provide slightly less damping, due to imperf...
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[quote user="coops"]Romy Hi sorry to have wandered off topic, I am listening at the moment to an MSB Platinum Dac III, hoiping to get the lavry back for comparison, I believe the MSB is multi bit based on a ladder resistor , with 4 24 bit DAc m...
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Yes, this is I was asking for. Then quiescent current per tube is +or- 1.2mA, total 3.6mA through 6K resistor.
As you stated, the power supply you built is like put a jet engine to a Honda Civic, but I have the irons and I like the idea. If necesary...
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Does anybody try to change shunt regulators OA2 to 15K Ohm resistor?I heard from number of people that OA2 is too noisy for phonostage.For example, in this article wrote about this http://www.audionote.co.uk/articles/tweak_ai_p2_phono_mod_0...
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...but for a different reason.After lots of traveling I'm finally back and continue my long lasting assault on 834.Pieter kept his word and the nano core transformers (both his MkII and a experimental pairon my yet bigger cores) are here. I removed a...
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[quote user="N-set"]
- considering another red tip 12AX7 for the output but given the change was not big at the input it's more of an itch...a costly one at $275
[/quote]After a second thought actually the output tube is obviously in the feedback...
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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 get hold of a scope to che...
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Hello to everyone, am new to the sight. Been reading for a while and decided to mod my 834. I've had the unit since '96, purchased new from the local dealer. I have noticed a few differences from the schematic, the 220K load resistors R10 and R110...
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Alex, I think that there is VERY high probability that your hum is from transformer-correctors interfaces. Get rid the transformer, change the loading resistor accordingly and use the corrector with high outpour cartridge, let say over 3mV. If you w...
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[quote user="Axel"] I was hoping to get some specifics from you when looking at a BEST "impedance match" ~ 1:1 with the cart in use, and if you had figured out some ball-park value which then can be used as point of departure for listening test.[/quo...
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Romy,I try to remove the step-up transformers & short the
input grid, the hum has gone.Than, I did next changes:1. Twisted wire from input RCA to step-up transformers. Connect transformers input & output ground directly (not thought ground ...
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The ECL82 = 6BM8 was used a lot in low-end amps, both push-pull and single-ended. Actually, according to your radio's schematic to which you posted a link, they are not being used "one per channel," rather it is a mono radio (nothing wrong with that...
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Dear Romy, regarding your efforts to solve variations in mains power supply, there has been an interesting thread on RAT related to the use of toroids as power transformers that morphed into a discussion about the level of DC offset in mains power su...
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[quote user="anthony"]In the 6 Channel Version of Super Melquiades
thread at post #89 you mention trouble you
were having with some NC relays that you were using to disconnect some power
supply bleeder resistors when the amp was turned on. When t...
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Ok, I do not know what it was: was it DHT, was it 300B, was it some other specifics of this given amp or whatever… but those two aspects that I named: intentional density of colors and randomness of pace are something that I would like to exercise in...
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[quote user="cv"]On the matter of the DHT having a plate resistance of 500-700... you do realise that running the 6E5p with an unbypassed cathode resistor is giving you an effective Rp of about 12k, right? The formula is, IIRC, Rp + (mu+1)Rk.[/qu...
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[quote user="Romy the Cat"] Well, I have to admit that I did not listen the whole sound of AC vs. DC filaments yet. I will bring home today my DC lab supply that I use for my electromagnet coil and will give the try. I still at this point am not...
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Similar to the famous sexist tail that women can be only ether pretty or smart the midbass horns unfortunately behave in the very same way: they can be only nicely placed in a room or they can sound good. You want the horn to place in a specific ...
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Because I feel that with your help, sooner or later I will solve this problem. So far I have been feeling very frustrated for days, so I decided to post this on the forum as a last resort. I do not know any people who know electronics constructi...
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[quote user="jessie.dazzle"] Resonant frequency :
I did not try to measure it. Can anyone confirm the following : I assume this parameter is most easily determined by playing a series of tones at constant signal strength (volume setting) whi...
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[quote
user="anthony"]Hi Romy,
Further to my earlier message, I've measured the bias
voltages for the driver tubes in all Channels.
A -4.3V not adjustable
B -13.82V not adjustable
C -4.8V not adjustable
D -4.2V (ran out of potentiometer travel...
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[quote user="anthony"]I woke up this morning to have the brightest thought that my DHT issues are probably caused by how I have wired up the filament transformers. [/quote]After rewiring the filament transformers this morning, I have spent all day tr...
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I agree that the total flux will be the same but therefor in the same iron structure, the field in the gap will be the same, at least in the statical case.If the system is modulated by the speach coil, a simpel measure of how well the...
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My sub-bass amp is back but I am not sure if I am comfortable with it. The guy from QAudio did a wonderful job to fix my modified B-2 power amp and now I have my amp for ULF with passive line level filter in it. So, Now I have two identical, fully fu...
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I woke up and thinking about the horn problem with fresh head I am thinking what did wrong. I did not measure the frequency response of the horn – I did not see a need for it – the sound of the thing is way beyond where it needs to be measured. I dis...
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Excellent news regarding this morning's discoveries. jd wrote:"...Are you able to say whether the problem is due to the horn position relative to the room, or to throat diameter relative to the driver diameter?..."Yes, a stupidly phrased question, bu...
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Ok, so you do not like 'soul' that you as the 'creator' have put into an object, that you happen to make what it is. - I guess that's not quite so fine by me, kind of stone-cold :-(Why would I CARE for a bunch of wires and a lump of metal, ...
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Hello again KIS
With unbypassed cathode resistor the input ECC83 is giving a gain of 30, adding the bypass cap boosts this to more than 60 thus gain will have more than doubled.
I can't try this mod yet because the 834P currently in my system i...
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Romy,Hi, new here. Great and very interesting website. I think a lot of people have misread you, they don't expend the time to actually think about some of the things you have said. Anyhow, looking at the above schematic (is this sa...
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