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Old 30th January 2006, 06:35 PM   #461
6h5c is online now 6h5c  Netherlands
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Quote:
Originally posted by poynton
I bet my stack of cd-players is bigger!!!
I couldn't resist posting it.....
(just to put things in perspective: that's not all of them....)

Ray.
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Old 30th January 2006, 06:42 PM   #462
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Quote:

Just a few of my tubes for the output.
[/B]

Hi.

Another tube I want to try is PC900 - small size triode

Andy
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Old 30th January 2006, 08:59 PM   #463
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Quote:
Originally posted by poynton
Hi Adfinni,

If you are using bitumen damping pads, don't go to Halfords or a shop which specialises in in-car entertainment. Go to you local car shop.
Halfords were charging 10+ for a 12"x12" sheet as were the ice shops. My local shop charged 3.75 for 12"x 24" sheet!

Andy
Don't worry, hate hate halfords as much as everyone else. I'm lookihn on ebay at the moment, as i doubt theres much different between the specialst audio dampening pads and the card sound deadening pads.

Ta ra

i off to oceana, bye bye guys
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Old 30th January 2006, 09:04 PM   #464
avr300 is offline avr300  Denmark
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Quote:
Originally posted by 6h5c


Hi avr,

Good one . I use a CD57 to compare my CD67SE-XXXL with.

Does the 63SE have an improved chassis, like the CD67SE?
Then I would say, use the SE for modding.

If there's no difference, use the standard for modding and the slightly better SE to compare it with. The PCB's are the same, and you're gonna take out all the parts anyway.

Regards,

Ray.

Hi Ray..

Yes it has, mainly a thicker baseplate. I think bluetag and bitumen are gonna do the job just nicely.

I just start unsolder the standard.

btw, ok picture

/avr
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Old 31st January 2006, 01:30 AM   #465
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Hi all,

I tend to go for the multipcb offering:
Their toroid is 70mm dia. / 37mm height and specified with 35VA.
Even their 50VA toroid is only 75mm dia. / 38mm height (and probably only 2-3 more)...
Right now, we are only using 27VA with our specifications. Should we change this?

Quote:
Originally posted by 6h5c
As for the 115V primaries: I think that's a good one! It will make the tranny more versatile (lovely word...versatile...). I can't imagine it will add loads to the cost.
OK, I'll ask for the additional costs.
Still, until now no one from the US seems to be interested...

Quote:
Originally posted by 6h5c
The idea behind the voltages is that it should be possible to use two-stage regulators, but to stay below 24VDC raw input voltage for the various commercially available regs. With 17VAC that will just be the case, and it's not going to be unloaded anyway.
For two regs we'll need at least 2 times 2,5...3V drop-out, plus the required 12V = 17...18VDC, plus some ripple and diode drop. We'll have a spare drop-out voltage of a few volts.
Please forgive me when I come up with the voltage thing once again:

I understand that 17V AC secondaries turn into something around 23V DC
when you consider ripple and diode drop. But since we load the 200mA windings with only 35mA,
I would still expect the DC voltage to be higher:

A toroid this size has a regulation of 16% when unloaded.
How much of this regulation remains when it is only partially loaded?
(I have no idea...)
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Old 31st January 2006, 07:27 AM   #466
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AVR300 - SE as the reference cd player. mmmm.

The SE has quite a lot of improvements over the standard player,
most caps around the dac ,op amps and Hdam are elna silmics and cerafine.
and the 4.7 ohm resistors are changed to 5% types on power rails etc.
The tx is also improved with better caps on psu

The hdam has copper shield and there is the chassis braise + extra damping plate on the bottom of player.

So you can use this as a reference or mod it. It will be easy to get the standard 63 past these levels by changing a few critical components, so I would change these bits on the SE and get bigger gains

I often do very simple mods (output caps , opamps , hdam , a few caps and resistors) to SE players and they become sooooo much better than the KI in standard form, infact you would think the SE was twice the price.
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Old 31st January 2006, 10:26 AM   #467
6h5c is online now 6h5c  Netherlands
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Hi avr,

My point exactly. You should use the improved chassis of the SE for your modded version.

Ray.
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Old 31st January 2006, 10:53 AM   #468
6h5c is online now 6h5c  Netherlands
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Quote:
Originally posted by Michi124
Hi all,

I tend to go for the multipcb offering:
Their toroid is 70mm dia. / 37mm height and specified with 35VA.
Even their 50VA toroid is only 75mm dia. / 38mm height (and probably only 2-3 more)...
Right now, we are only using 27VA with our specifications. Should we change this?

Please forgive me when I come up with the voltage thing once again:

I understand that 17V AC secondaries turn into something around 23V DC when you consider ripple and diode drop. But since we load the 200mA windings with only 35mA, I would still expect the DC voltage to be higher:

A toroid this size has a regulation of 16% when unloaded.
How much of this regulation remains when it is only partially loaded?
(I have no idea...)
Hi Michael,

This is the reason I pleaded for a smaller tranny in the first place, instead of a 50VA. As we don't really need the power, the voltages are going to be a bit higher. How much is going to be a guess.

Let's assume that if we load it with half the power, the regulation is going to be like 10%?? Then we would get 18.7VAC from the 17VAC winding. The peak value is 18.7*1.4142 = 26.4VDC. Minus two diode drops (1.4V) leaves 25VDC. But since there's always a load connected it's going to sag, and will probably say below 24VDC. It's a theoretical value, if your mains voltage is a bit higher, it could be above 24V, if you use smaller caps it will be lower.

Personally I don't have a problem with it, since my regulators can handle 35...40VDC input. We could tune the voltages down a bit to be sure. How do the others feel about this?

I don't think we should change the tranny to 35VA, since that will only make this effect worse. It's not a problem to have a slightly more capable core.

Regards,

Ray.
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Old 31st January 2006, 10:58 AM   #469
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I think we should stay @ 20V so that everyone can use the TX. We all have different regs/reg pcbs.
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Old 31st January 2006, 01:25 PM   #470
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hi.

Bigger VA, Lower Off-load voltage =
Better Regulation = Better PSU

If a bigger VA toroid is available for a few cents more and it will fit, then this is the better option.

It does not matter whether discrete or 7805-type regulators are used, the whole idea of a psu is to provide a stable output voltage, regardless of the load conditions. The psu will not perform to its best if an inadequate Tx is used ( like the oem!!!)

The idea or replacing the Tx must be considered to be part of the rebuilding of the PSU section along with diodes, caps, pre-regulator if required etc.

For those worried about the offload voltage, you can always use an (extra) preregulator - it will NOT degrade performance.

Andy


PS Lower noise is a beneficial by-product of PSU regulation!
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