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2:1 Step Up Device for low output cartridges.

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Smokeyjoec View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Smokeyjoec Quote  Post ReplyReply Direct Link To This Post Topic: 2:1 Step Up Device for low output cartridges.
    Posted: 04 Jul 2019 at 1:55am
What about an Accession (simplified) with variable output gain and switches for capacitance, mono and 2 outputs without the numerous RIAA curves.  I’m not sure how much that would simplify the circuit design and reduce the costs?


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Lucabeer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucabeer Quote  Post ReplyReply Direct Link To This Post Posted: 03 May 2019 at 5:53pm
Graham, I had missed this discussion!

If you will ever make such a phono stage, let's call it a "Reflex M+":

- innovations introduced to of the Accession for the RIAA equalization kept separate from amplification (your patent, in short - no need for selectable equalization curve or "flat", though)
- selectable gain (let's say 40 dB, 44 dB, 48 dB for MM)
- mono switch
- selectable resistive and capacitive loading via easy front switches (no rear mini-switches)
- no volume pot (unless used to select the gain!)

... well, you already have a customer!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 10:04pm
At some point and on my list of things to do, I will be making a high output phono stage to suit those who insist on using insensitive valve amps. Such a device needs a very high supply voltage so that the signal doesn't clip. Actually it needs more than the usual 36 volts which opamps work on, and so requires the use of a ranging supply. I had thought of incorporating it into the "big Accession". I had also thought about giving each input (yes, this will have inputs for two cartridges) its own level control. Therefore it will do exactly what you're looking for. We will be happy to accept trade-ins Wink
Not simple enough for Google-Bot to understand...
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GrahamD View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GrahamD Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 9:56pm


Easiest way is to attenuate the loudest one. A double pole switch and four resistors (two per channel) between phono stage and amp input would do that.
[/QUOTE]
 
Ah yes, I've already done that with a DIY L Pad to the CD player input to the amp.
Now I would like to do the opposite ( amplify rather than attenuate) the Denon HOMC output.
If this is going to be more trouble than it's worth I'll forget about it and just turn the volume up.
 
Cheers
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Drewan77 Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 5:15pm
This isn't an answer to GrahamD's question but it gives me a chance to praise the Majestic/Accession for the way they solve the same issue in my system.

My preamp has two analogue inputs - one balanced XLR, the other standard RCA. 

One turntable goes via the Accession variable output directly into the preamp (RCA).

The other via a Reflex M using the Majestic analogue input & then into the preamp (balanced, using the Majestic variable output). The Majestic also handles various other digital devices.

With the volume dials on both Slee devices set by ear, all inputs, digital and analogue remain at the same volume level when switching.

Perfect! Big smile
Older than I once was, younger than I'll be
.............................
Andrew
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 11:53am
Originally posted by GrahamD GrahamD wrote:

...and have been accused of solving problems that don't exist.


Well, this one definitely exists...

Easiest way is to attenuate the loudest one. A double pole switch and four resistors (two per channel) between phono stage and amp input would do that.
Not simple enough for Google-Bot to understand...
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tg View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tg Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2017 at 10:41am

This thread covers the issue of perceived greater surface noise from the DL-110 and offers a method to reduce that that does not involve output boosting.

It might prove of interest to have a read of it.




Edited by tg - 17 May 2017 at 10:44am
Tony G
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