[jamato8]

I am listening to the maxxed out version of the fi.Q with Black Gates, stacked buf634's in the ground channel, 4 buf634's per channel and the OPA637. I would say this should have plenty of power to drive just about anything, maybe even small speakers or my Klipsch Chorus. :^)

One of many things that is so great about the fi.Q is that anyone can take their standard equipped fi.Q to any level. The maxxed out version commands another level of respect. Very well done Ryuzoh.

So I wonder how the Maximus would sound with 2 buff634 per channel and stacked HA5002? I have a couple of special adapters from Xin for the smd 5002 that is stackable so it also works in the standard wiring of 634's etc.

 

[ryuzoh]

Happy new year, guys

I just assembled 14th BG model...LOL

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif I only have the ARZ version but may get the BN version if they are worth the price difference. I'm just waiting for answers regarding this...

The BNs you mentioned in the mail is so risky one.
You had better buy BRZs from Digi-key and solder up like below.
I don't trust any shops in HK on eBay, only trusting cordless89.
Attachment 24234

Quote:

Originally Posted by jamato8 /img/forum/go_quote.gif I never measured the batteries at low voltage and I haven't run mine to that point yet. The only measurement I made was then referred to the charge on each battery, as in 1.39 volts per battery as fully charged. 1.29 or so would be the minimum I would want to discharge the battery.

Auto-shutdown will run when getting at 10.2V (0.85V each cell).
Also power-LED will blink with 10.8V or less (0.9V each cell).
This is by guideline of Sanyo.

Quote:

Originally Posted by qusp /img/forum/go_quote.gif no problem, as it happens i'm about to go out to the movies, seeing sherlock holmes I like the look of this version. looks more true to the character in the books ie. a philandering drunk with an opium problem not some english git with a top hat that speaks properly. no problem on the 797 recommendation, its still what i'm using and I actually havent changed it at all for a couple of days now. so other than installing the buffers and caps I think i'm there at least for a while. will see what it sounds like with the OPA637BM in ground in a week or so when my farnell order arrives. i'm not a big fan of the OPA627 in amp position, but I did order 2 637sm just in case; I think the modern chips such as OPA827, OPA211, AD797 are superior. OPA2107 is on its way as well and looks to be a top performer. I wonder what it is with all these burr brown chips ending in 7 that sound great.

Thanks, Dr.Watson

Also, OPA2107 has so widely opened stage and very suitable with HD800....

Quote:

Originally Posted by slwiser /img/forum/go_quote.gif It would appear to me that the ADA4627-1 is not simply a drop in opamp to replace the AD712 default opamp. It is not available in a DIL package.

Absolutely, that's modern OPAMP as qusp said....
DIP package is no longer mainstream.
Then, how about OPA2111KP, OPA2107AP, OPA602BP, they are all significant and will give you interesting sounds

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif Have the OPA637BP's and AU's but never thought of either in ground.

That will make this amp an oscillator.

Quote:

Originally Posted by jamato8 /img/forum/go_quote.gif I am listening to the maxxed out version of the fi.Q with Black Gates, stacked buf634's in the ground channel, 4 buf634's per channel and the OPA637. I would say this should have plenty of power to drive just about anything, maybe even small speakers or my Klipsch Chorus. :^) One of many things that is so great about the fi.Q is that anyone can take their standard equipped fi.Q to any level. The maxxed out version commands another level of respect. Very well done Ryuzoh. So I wonder how the Maximus would sound with 2 buff634 per channel and stacked HA5002? I have a couple of special adapters from Xin for the smd 5002 that is stackable so it also works in the standard wiring of 634's etc.

Glad to hear that

Then remove 3-stacked 634Ps on G_CH, that is needless and wasting currents when 3ch architecture applied.
BUF634U+HA-5002 buffer combo is my favorite, and why not you try it?.....LOL

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif Hi Ryuzoh, as we have not had the two switch block uses clarified I assume that R19 is activated by the use of switch #1 on the block next to ground, is that correct?

No, R19 is for G_CH buffer only, each SW1 are assigned to L/R BUF634s.
But I think you'll apply other OPAMPs on G_CH socket, so I don't recommend you to solder R19, and a resistor for BW mode (as 100 ohms) should be attached onto BUF634P directly.

 

[jamato8]

Ryuzoh, I am confused. So are you saying if I use the HA5002 in the buffer section why do I go from 4 channel in the ground to 3 channel? Or are you referring to something else?

 

[qusp]

I think hes saying that since you are using the amp in 3 channel mode to remove the stacked BUF634 in the 4th (ground) channel. they are wasting current if there and not being used.

 

[qusp]

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif Hi Ryuzoh, as we have not had the two switch block uses clarified I assume that R19 is activated by the use of switch #1 on the block next to gound, is that correct? I would still like exact clarification of 'both' switch blocks and Jeremy can then include them in his ''All You Needed To Know About The Fi-Quest But Were Afraid To Ask'' Post if he ever gets to it that is? (Only 1/2 kiddin' Jeremy ).

all info is collected, but every time I think i'm done something else is added lol.

i'll just add the stuff thats been said in the last day as its quite pertinent and i'll shoot it off to ryuzoh and post it here for review. i'm not doing anything really with design and I havent added much at all myself, just collected info.

 

[ryuzoh]

DP

 

[jamato8]

Yes, that is what I understood.

So what have you found you like best. The 3 or 4 channel? I know there are inherent problems with 4 channel and on the other fi.Q I was hearing something that sounded like some DC offset at times when in 4 channel with the stock opamp that came with it. With the 792 I don't hear it.

edit:I didn't look at the ground jumper and thought the maxxed fi.Q was already in 4 channel. I see that it is in 3 channel so now I realize why you said you would take the buffers out. I will try it in the 4 channel.

 

[ryuzoh]

Quote:

Originally Posted by jamato8 /img/forum/go_quote.gif Ryuzoh, I am confused. So are you saying if I use the HA5002 in the buffer section why do I go from 4 channel in the ground to 3 channel? Or are you referring to something else?

No, what I'm saying is 634Ps on G_CH will work on 4ch mode only, and will waste currents if you choose 3ch mode, and will shorten runtime.
So 3-stacked one should be removed when you use with 3ch mode.

And I'm recommending you to try 5002+634U combo on BUF section.
Upper DIP socket: HA-5002 adapter
Underneath: Stacked 634Us

Added--
Quote:

Originally Posted by qusp /img/forum/go_quote.gif I think hes saying that since you are using the amp in 3 channel mode to remove the stacked BUF634 in the 4th (ground) channel. they are wasting current if there and not being used.

Haven't seen this post when I post above

Quote:

Originally Posted by qusp /img/forum/go_quote.gif i'll just add the stuff thats been said in the last day as its quite pertinent and i'll shoot it off to ryuzoh and post it here for review. i'm not doing anything really with design and I havent added much at all myself, just collected info.

Okay, I'll answer pictorially as long as possible

 

[ryuzoh]

Quote:

Originally Posted by jamato8 /img/forum/go_quote.gif So what have you found you like best. The 3 or 4 channel? I know there are inherent problems with 4 channel and on the other fi.Q I was hearing something that sounded like some DC offset at times when in 4 channel with the stock opamp that came with it. With the 792 I don't hear it.

IMO, always preferring 3 to 4.
The reason is DC as you're saying, unavoidable issue with 4ch architecture.
The hiss problem which was mentioned at this thread before is also cleared by R20 jumpering (should be applied in all fi.Qs).

Quote:

Originally Posted by jamato8 /img/forum/go_quote.gif edit:I didn't look at the ground jumper and thought the maxxed fi.Q was already in 4 channel. I see that it is in 3 channel so now I realize why you said you would take the buffers out. I will try it in the 4 channel.

Algight

But I don't recommend to try with JH13.
If you want, please use with unstacked BUF634P to reduce DC.

 

[jamato8]

Ok but I am already trying it and didn't think about the additional DC offset. I am listening with the 13's with all the stacked buffers in the ground channel. The amp really does sound different. To my ear, at this time, even more dimensional. I will do more comparing. I have pretty good hearing, still up to 17 khz and I don't hear any hiss. I know I have read of others having a problem with it and I can't stand hiss but so far in 4 channel no problem with hiss and no small clicks and pops or static that can or may indicate too much DC offset. Well more time to compare is needed.

 

[qusp]

Jon, yeah i'm still undecided about 3 vs 4 channel. most of the time I prefer 3, as to these ears the soundstage is a bit more cohesive this way.

Ryuzoh: yeah I had to restrain myself with regard to design for this, so i'm not really going to start. many here will know that graphic design and in particular compositing for print and some film was my profession as well as some cheffing, but i'm too much of a perfectionist and obsessive by nature, so would often spend many hours past the point where the job was done to a perfectly acceptable level, to get it up to MY standard and then i'm the only person who noticed the difference

so I wont be doing much any design in it as I would spend too much time on it.

 

[jamato8]

I will play more with the settings on the Maximus when it settles. I know the caps were already formed but it is going through a funk stage right now of heavy bass and so so detail. Part of reforming the caps after soldering etc.

Gah, I have a review I need to get done also on some montors. My side of the table with all my equipment and amps makes me look a little looney.

 

[SpudHarris]

Quote:

Originally Posted by ryuzoh /img/forum/go_quote.gif No, R19 is for G_CH buffer only, each SW1 are assigned to L/R BUF634s. But I think you'll apply other OPAMPs on G_CH socket, so I don't recommend you to solder R19, and a resistor for BW mode (as 100 ohms) should be attached onto BUF634P directly.

Thanks for all the clarifications Ryuzoh.....

You quoted BUF634 with 100R in R19 as your favourite in ground but also said you prefer 3 channel operation, so doe that mean you are using a buffer in ground channel with 3 channel operation?. I've been using 3 channel but with BUF634P's (2 x stacked) in ground and like it very much, is this not good?

Also what does switch 2 do on the block next to ground? Switch 1 on both blocks are for L/R buffers yes?

 

[qusp]

Nigel, ground is the 4th channel, what you have in there is immaterial if you are using 3 channel mode. all the ground channel buffers are doing in this case are sucking power and they have no influence on the sound whatsoever. they are still in the circuit because the 3/4 channel jumper only decides what is included in the audio signal.

he said BUF634 and 100R IF using 4 channel, but also said he prefers 3 channel. as I do. after further listening today i've pretty much sealed that

 

[SpudHarris]

Ahh, so if you are using 3 channel mode you are utilizing the LT1210 that is already installed as the 3rd channel is that correct? and what ever goes in ground only takes effect if 4 channel mode is sellected.

I know you say it is immaterial what goes in ground if you are using 3 channel mode but different chips in that socket still change the sound so still count don't they. I'll solder up a BUF adapter with a 100R and give the 4 channel mode another go.

What set up have you settled on Jeremy? Mine at present is 797's in L/R single BUF634's with #1's switched + OPA827 in ground, 3 channel mode.....