luvdunhill Posted September 16, 2008 Author Report Posted September 16, 2008 Yes! the wife needs to take her into the doctor's office, so I have to sit the other kids I am an amatuer!! Aero Engineer, so I have enough electrical knowledge to be dangerous Does R27 always remain as 47K, or do you change it based on resistor load reqmt for the cart? yes, the 47k is the Zin of the circuit. So, any additional loading is simply placed in parallel with this 47k. so, all those "standard" loading values you see for a given cartridge, the additional question that always needs to be asked is what is the input impedance of the phono preamp. No one asks though, which is funny. I'm sure it is usually 47k, but still ...
luvdunhill Posted September 16, 2008 Author Report Posted September 16, 2008 Yes! the wife needs to take her into the doctor's office, so I have to sit the other kids man, I figured my wife was the only one who used that line ...
DigiPete Posted September 17, 2008 Report Posted September 17, 2008 The boards are WORKING!!! I'll post pics and readings later tonight Thanks to Marc for catching my error
luvdunhill Posted September 17, 2008 Author Report Posted September 17, 2008 The boards are WORKING!!! I'll post pics and readings later tonight Thanks to Marc for catching my error sweet!
luvdunhill Posted September 17, 2008 Author Report Posted September 17, 2008 This is a good sign.. no post from Pete.. Probably in analog bliss now.. I'm off to bed...
guzziguy Posted September 17, 2008 Report Posted September 17, 2008 This is a good sign.. no post from Pete.. Probably in analog bliss now.. I'm off to bed... He's either in analog bliss or in children hell.
DigiPete Posted September 17, 2008 Report Posted September 17, 2008 I'm in "glad the boards aren't majorly f'ed up bliss" I did some more minor assembly on the boards, sent some measurements to Marc for his trannie matching. Everything looks good so far. One board has higher voltage coming out of the regulator and zener 29.36v at regulator output vs. 30.27v 9.17v at zener vs. 9.44v not sure if I need to mess with getting this tighter or not?? I don't think I will be able to listen to them before Friday though, just way too busy this week.... arghhh
deepak Posted September 17, 2008 Report Posted September 17, 2008 Nice! I can't wait till I have some free time
DigiPete Posted September 18, 2008 Report Posted September 18, 2008 Listening to the Pearl Phono right now
DigiPete Posted September 18, 2008 Report Posted September 18, 2008 ..... lets get this out of the way, this thing kicks ass Compared to my Channel Islands Phono, from memory: Right off, deeper more authoritative and defined bass, but not bloated More resolving and faster, just more detail top to bottom. I can hear more details, even more groove noise, pops etc, recordings sound mo' different from one another, some duller, others just fantastic. The highs are accurate, extended, sweet, not overemphasized. The soundstage is wider and more depth as well. Sounded a bit congested the first hour or so but is improving rapidly, or was that a crappier album? Pup another newer album on and wow, everthing kicks! Still listening..... the voltage regs staying really cool
deepak Posted September 18, 2008 Report Posted September 18, 2008 Wow...I can't wait to compare this to my NAD PP-2
swt61 Posted September 18, 2008 Report Posted September 18, 2008 It should absolutely roast the NAD. Great news DigiPete!
DigiPete Posted September 18, 2008 Report Posted September 18, 2008 Currently running it uncased and running both channels with only one bridge rectifier and one big smoothing cap. I will let it break in for about 50 hours worth or record play, then do an A/B with the CIAudio then I will install the teflon bypass caps to see what I can hear. The gain seems a bit lower than the CIAudio which I think is set a 50 db. I would guess I'm getting around 40 db. Does this seem right Also this phono is dead quiet, turned up the receiver all the way.... no noise.
909 Posted September 18, 2008 Report Posted September 18, 2008 our carts probably have exactly the same output level and i've set the gain for headphone listening with my L3000s at 35db on my PS-1 Monolithic, but bump it up a notch to 44db with the Cicada speakers. i can't listen for long at the highest setting, 53db, without some irritation and eventual fatigue.
deepak Posted September 18, 2008 Report Posted September 18, 2008 Marc said it should be able to do .5 mv, do you think there will be hiss problems running MC carts in that range? If I could I'd love to try the .48mv Bloom with the Pearl. I know my headphone amp will have sufficient gain.
DigiPete Posted September 18, 2008 Report Posted September 18, 2008 My Denon DL-160 puts out about 2.2mv, so 0.5mv is 1/4 of that. Not sure the Pearl is putting out the advertised amount of gain (59db??), or I am doing something wrong.
DigiPete Posted September 19, 2008 Report Posted September 19, 2008 Some more pics, now I need to get some enclosures...
luvdunhill Posted September 19, 2008 Author Report Posted September 19, 2008 My Denon DL-160 puts out about 2.2mv, so 0.5mv is 1/4 of that. Not sure the Pearl is putting out the advertised amount of gain (59db??), or I am doing something wrong. yeah, I'll have to think about it... I'm assuming you may need to decrease the source resistors for the second pair of transistors? I'll think some more when I get back into town... man, Seattle is a fun place
DigiPete Posted September 19, 2008 Report Posted September 19, 2008 yeah, I'll have to think about it... I'm assuming you may need to decrease the source resistors for the second pair of transistors? I'll think some more when I get back into town... man, Seattle is a fun place Take a detour down to So Cal
swt61 Posted September 19, 2008 Report Posted September 19, 2008 man, Seattle is a fun place My all time favorite city!
DigiPete Posted September 23, 2008 Report Posted September 23, 2008 What connectors and cable (gauge, as well) should I use for the power from the PSU to the enclosure with the Pearl Boards?
luvdunhill Posted September 23, 2008 Author Report Posted September 23, 2008 What connectors and cable (gauge, as well) should I use for the power from the PSU to the enclosure with the Pearl Boards? I'd recommend something shielded for the input and something kinda beefy for the power. I haven't really thought this far ahead though
luvdunhill Posted October 2, 2008 Author Report Posted October 2, 2008 perhaps for the input, the Cardas shielded wire would be a good option. I'm thinking about trying those for myself. Also, all the rest of the devices have been matched and will be mailed this week. Thanks for your patience (except DigiPete).
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