Hey all, here's the latest photo of electronics and a speaker: Thorens TD-124 with an ATP-12T 10" tonearm (thanks to xcortes), Panasonic strain gauge cartridge, stock Seduction with a battery/C4S-ed low-voltage supply for the cartridge, Smack-as-pre with MQ cobalt 15K:600 OPT's, stock S.E.X amp running fullrange and driving tweeter and mids via speaker-level crossovers, stock S.E.X. amp preceded by a Marchand XM46 PLLXO 2.5K low-pass @ 220hz (LR4) and a coupling cap tuned to 72hz driving the midbasses, and XM46 low passes @ 60hz (LR4) driving the line input of an old Marantz receiver and the bass bins. Believe it or not, thats the brief description 8). Interconnects are twisted pairs of 20-ish gauge solid silver/teflon wire and Amphenol RCA's. Whew! Best sound so far out of a system thats admittedly way too complicated. Lots to go, still....
smack-as-pre
- Thread starter keto
- Start date
I can't make out my R values, but I did post that I'd used 0.0033uF and 60.4K in parallel and 80.6K to ground, followed by the Seduction's 0.1uF and 1M to ground. I use a 0.068uF/47.5K on the input to set the high-pass at 50hz. Judging from the frequency graphs you put up, I think it would make sense to increase that cap size, to maybe as much as 0.1uF.
Following is PJ's post and circuit...
"Here's mine, between the triodes of the Seduction. It is not amenable to use with a pentode stage, since it relies on a low source impedance (much less than the 75K resistor; in Seduction it's about 4-5K). The parts marked * are already part of the Seduction circuit."
Following is PJ's post and circuit...
"Here's mine, between the triodes of the Seduction. It is not amenable to use with a pentode stage, since it relies on a low source impedance (much less than the 75K resistor; in Seduction it's about 4-5K). The parts marked * are already part of the Seduction circuit."
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4krow
Guest
I wish that I owned an Audiophile museum. I would definitely have those speakers in it.
Hey Eric, thanks. Eventually I'd like it all to look a little less DIY, but in the meantime, there's no disguising. 4krow, I've been hooked on the idea of these speakers for a long time, and its nice to have them running closer to their potential.
The latest is the completion of the 3rd S.E.X. amp in the system (black PT), which will eventually be the midrange amp, running a 1st-order pass-band of 220-1150hz. What I really need for this amp is a pair of 8K:2 trans- or auto-formers (preferably of the Nickel MQ variety -- Hey Mike, ya out there?? 8)). The mids are 4 8-ohmers in parallel, I could always put them on a 4-ohm tap with a little series resistance, but it would be even cooler to have full power.
Next up is converting the other two S.E.X. amps to 6EM7 mono-blocks, using some EXO-045's, for midbass duty of 60-220hz, and from there take a stab at shunt-regulating them....
The latest is the completion of the 3rd S.E.X. amp in the system (black PT), which will eventually be the midrange amp, running a 1st-order pass-band of 220-1150hz. What I really need for this amp is a pair of 8K:2 trans- or auto-formers (preferably of the Nickel MQ variety -- Hey Mike, ya out there?? 8)). The mids are 4 8-ohmers in parallel, I could always put them on a 4-ohm tap with a little series resistance, but it would be even cooler to have full power.
Next up is converting the other two S.E.X. amps to 6EM7 mono-blocks, using some EXO-045's, for midbass duty of 60-220hz, and from there take a stab at shunt-regulating them....
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Paul Joppa
Moderator
Is there a reason you don't wire the mids in series-parallel for 8 ohms total?keto said:
Paul Joppa
Moderator
Easy. Parallel in pairs, put two pairs in series.
Thanks!
So, if two drivers are connected in series (+-)(+-), are their outputs in-phase? It would be great to go with the standard iron.
***I've done some reading on series-connected loudspeakers, and phase, and now understand how they work.
The 6DN7 driving the four mids will work well, I think, with a 1155hz low-pass on the input and the coupling cap tuned to 365hz
For the 6EM7 and EXO-045's and 40mA/50H chokes in S.E.X. monoblocks, how about 250Vpk 40mA -42.5Vg as a point of departure? There'd be just one 6EM7 per S.E.X. amp, in case overall HV current draw is a consideration. I'm thinking of this circuit for the 97dB mid-basses.
So, if two drivers are connected in series (+-)(+-), are their outputs in-phase? It would be great to go with the standard iron.
***I've done some reading on series-connected loudspeakers, and phase, and now understand how they work.
The 6DN7 driving the four mids will work well, I think, with a 1155hz low-pass on the input and the coupling cap tuned to 365hz
For the 6EM7 and EXO-045's and 40mA/50H chokes in S.E.X. monoblocks, how about 250Vpk 40mA -42.5Vg as a point of departure? There'd be just one 6EM7 per S.E.X. amp, in case overall HV current draw is a consideration. I'm thinking of this circuit for the 97dB mid-basses.
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Paul Joppa
Moderator
Sorry I didn't see this until now - that looks good on the graph.