95% (or 99%!) of all RIAA amps are simple. You have to go over 300 USD in order to get higher "techology". Most RIAA amps consists of a NE5532/34 or a 4556 plus a few passive components.
Check for instance NAD PP-1 and MTech, not cheap, very simple.
The vinyl market is rather limited these days and has no future (like tubes).
Check for instance NAD PP-1 and MTech, not cheap, very simple.
The vinyl market is rather limited these days and has no future (like tubes).
Re: Re: Simple RIAA phono preamps
This was a new one, never seen it. Very beautiful, but batteries....
16 hours at 4-6 USD (in Sweden), expensive but rechargable batteries are an alternative.
Rather high noise though (but lower than the vinyl itself).
I wonder if the gain is for 1 kHz?
http://www.hagtech.com/trumpet.html
Cool!
planet10 said:
This was a new one, never seen it. Very beautiful, but batteries....
16 hours at 4-6 USD (in Sweden), expensive but rechargable batteries are an alternative.Rather high noise though (but lower than the vinyl itself).
I wonder if the gain is for 1 kHz?http://www.hagtech.com/trumpet.html
Cool!
DJ mixers invariably use a simple phono preamp design. Check out the schematics on www.rane.com
Bugle!
The schematics of the Bugle can be downloaded from http://www.hagtech.com/bugle.html
I have tried some different op-amps, and caps, (the Wima caps are similar type as used in the "Cube").
There is a small "bug" : thermal noise when constructing/using very high gain, (over 45dB).
I think this can be bettered by a small re-design, using less resistance...
Per Anders, you can probably see and explain better...
Arne K
Norway
Yes, chassis is from Taiwan...
The schematics of the Bugle can be downloaded from http://www.hagtech.com/bugle.html
I have tried some different op-amps, and caps, (the Wima caps are similar type as used in the "Cube").
There is a small "bug" : thermal noise when constructing/using very high gain, (over 45dB).
I think this can be bettered by a small re-design, using less resistance...
Per Anders, you can probably see and explain better...
Arne K
Norway
Yes, chassis is from Taiwan...
Re: The Bugle
Arny,
Nice... was that since i emailed you the URL?
Way better than the Radio Shack you had enquired about.
I was thinking one of these might be good mounted in the plith of a TT. Now i'm thinking i should go ahead.
Coupled with a variation of Dice's linestage in the tube pre-amp thread i could lose my store-bought pre.
dave
Cobra2 said:
Arny,
Nice... was that since i emailed you the URL?
Way better than the Radio Shack you had enquired about.
I was thinking one of these might be good mounted in the plith of a TT. Now i'm thinking i should go ahead.
Coupled with a variation of Dice's linestage in the tube pre-amp thread i could lose my store-bought pre.
dave
Re: Bugle!
Yes, check the resistor values of the feedback. Way too high! Almost any RIAA of class has values from 5-10 ohms, max 100 ohms (MC) to 100-220 ohms, max 470 ohms (MM). High values generates noise.
OPA2130, ugh! noisy! NE5534 has 12 dB lower noise!
To have resistors in series with the non-inverting input are also totally unneccessary, adds noise only. The opamps are FET-type = very low input bias current => Resistor matching means nothing in order to reduce offset voltage. Since OPA2130 is a FET amp, this resistor choice can reduce distortion but I think it's more wise to have low resistor values instead, then the distortion will be low
Cobra2 said:
Yes, check the resistor values of the feedback. Way too high! Almost any RIAA of class has values from 5-10 ohms, max 100 ohms (MC) to 100-220 ohms, max 470 ohms (MM). High values generates noise.
OPA2130, ugh! noisy! NE5534 has 12 dB lower noise!
To have resistors in series with the non-inverting input are also totally unneccessary, adds noise only. The opamps are FET-type = very low input bias current => Resistor matching means nothing in order to reduce offset voltage. Since OPA2130 is a FET amp, this resistor choice can reduce distortion but I think it's more wise to have low resistor values instead, then the distortion will be low
Dave...
I will come back to you later...on more of your mu-metal...
I did build the Bugle several months ago, actually, I built 2...
The RS unit, was just to check what "everybody" at AudioAsylum raved about...(and I have more friends...), I do not believe it is very interesting.
Now, I also have one of Jocko's RIAA, (it's superb), and I have sold my Ortofon T-3000 Step-up trafo, and soon also my Denon AU-340 Step-up...
How great it is to be a bachelor.......
(BTW, I'm also car-crazy, having a Cobra II + 2 x Capri....)
Arne K
Norway
I will come back to you later...on more of your mu-metal...
I did build the Bugle several months ago, actually, I built 2...
The RS unit, was just to check what "everybody" at AudioAsylum raved about...(and I have more friends...), I do not believe it is very interesting.
Now, I also have one of Jocko's RIAA, (it's superb), and I have sold my Ortofon T-3000 Step-up trafo, and soon also my Denon AU-340 Step-up...
How great it is to be a bachelor.......
(BTW, I'm also car-crazy, having a Cobra II + 2 x Capri....)
Arne K
Norway
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