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Help deciding what amp to purchase (Read 955 times)
DVDMike
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Help deciding what amp to purchase
01/04/20 at 01:08:00
 
I have circa 1990 Klipschorns with AK3 crossovers. †I am currently running them off an adcom 555II. †Iíve got more than enough power. †But Iíd like to try tubes. †Everyone who has klipschorns says they never sounded better that when they are connected via tube based amp. †

What Iíd like to do is bi-amp the klipschorns and use the tube amp to power the upper end, mid and high. †Iím really not sure how much power I need from the tube amp. †

I was looking at the MODEL SE34I.5 †Is this enough power to run both left and right channels to reference levels? †Or would another amp be more appropriate with my speakers?

I like that you can add a pass through preamp signal through where I could feed the amp running the bass pins. †If you add this, does it come with a dedicated signal/volume limiter so I can independently control output of the 2 stereo amps? †If it doesnít, itís really useless for me to buy the extra output option and Iíll have to split the signal before going to the se341 or whatever tube amp I get.

There are some additional up charge options listed. †Iím not really sure I understand all of them to know if I need them or not. †(I understand the cosmetic ones).
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busterfree
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Re: Help deciding what amp to purchase
Reply #1 - 01/04/20 at 03:22:41
 
IMO the SE34I.5 is plenty powerful enough for Klipshorns. What preamp are you using with the Adcom 555II? You may like the SE34I.5 alone or with your preamp. How big is your room?

The Adcom 555II has gain of 27 dB, and Input Sensitivity of 1.75V for 200 W into 8 Ω. The SE34I.5 needs 2.5V for full output.

I want to try a Decware Ultra for bi-amping, but I donít have one. † Smiley
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busterfree
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Re: Help deciding what amp to purchase
Reply #2 - 01/04/20 at 03:23:57
 
Welcome to the forum!
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DVDMike
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Re: Help deciding what amp to purchase
Reply #3 - 01/04/20 at 14:49:31
 
Buster, thanks for your input.  Can I test the output voltage of my preamp out ports with a voltage meter?
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busterfree
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Re: Help deciding what amp to purchase
Reply #4 - 01/04/20 at 14:52:46
 
Quote:
Can I test the output voltage of my preamp out ports with a voltage meter?


I donít know. Hopefully, others will chime in.
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Donnie
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Re: Help deciding what amp to purchase
Reply #5 - 01/04/20 at 15:12:28
 
I'd just look up the specs of the preamp.
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DVDMike
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Re: Help deciding what amp to purchase
Reply #6 - 01/04/20 at 15:12:38
 
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hdrider
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Re: Help deciding what amp to purchase
Reply #7 - 01/04/20 at 16:06:44
 
Welcome Mike- I would put a call into Steve, it may take while to connect but worth his advice. I played with bi-amp and even tri-amped for years, always sounded good but it wasn't until I pitched it all (except sources) and got our Decware/Omega rig that everything sounded organic and right. If that makes any sense. I would love to hear my Rachel driving some big Klipsch speakers someday. Please keep us posted on your findings and progress. This is a great bunch of Decfans here with a LOT of knowledge and opinions and a fantastic sense of humor. Happy listening, Chris.
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DVDMike
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Re: Help deciding what amp to purchase
Reply #8 - 01/04/20 at 17:30:48
 
Thanks Chris!
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Johnecake
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Re: Help deciding what amp to purchase
Reply #9 - 01/09/20 at 03:15:54
 
Hey Mike  I have 74 khorns and they were special but hard to tame. Horns do love tubes and the Decware makes them sing. I picked the Rachel 4 years ago because Paul Klipsch once said  What the world needs is a good 5 watt amp. Pick the Rachel or 1 or 2 Zens and you will be set. I have a sub cause I had one but honestly you donít need it, somehow those little watts drive those woofers just fine and the midrange and top is just plain sweet , the edginess is gone and the liveness pops. Khorns were made for SET amps. I also run a preamp itís much improved in clarity and balance for me. Itís easily the best sound I ever had in all the gear I vw had thru here.Do it you will love it and the horns will thank you.
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DVDMike
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Re: Help deciding what amp to purchase
Reply #10 - 01/09/20 at 12:39:56
 
John, thanks for weighing in.  I donít see the ďRachelĒ listed on the web site. Does this model go my a different name now?
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Re: Help deciding what amp to purchase
Reply #11 - 01/09/20 at 13:50:47
 
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DVDMike
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Re: Help deciding what amp to purchase
Reply #12 - 01/09/20 at 14:28:32
 
Got it, Rachel is the MODEL SE34I.5 I was thinking.  Thanks.
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DVDMike
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Re: Help deciding what amp to purchase
Reply #13 - 01/09/20 at 15:00:46
 
I ordered my ďRachelĒ. One question I have is about startup.  Iíve never owned a tube amp.  With most modern solid state amps, there is a delay circuit that prevents a thump going through your speakers.

Is there any noise / distortion that is sent to speakers during the power up time?

Also, Iím used to using a ďtriggerĒ cable.  Iím pretty sure this amp doesnít have one of these to power up instead of using the power switch.  But is there any harm in leaving the power switch on and remotely switching the ac power outlet on and off?  Or must you manually use the switch on the unit?

Are the tubes use available for purchase outside of decware or are they proprietary?
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4krow
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Re: Help deciding what amp to purchase
Reply #14 - 01/09/20 at 16:49:45
 
Since I have owned a Rachel for years (but no more), I can answer these questions for you. First off, tube equipment is not instant on after turn on, unless there is a pre warm up circuit . The Rachel does not have this. Point being the tubes must warm up for awhile before any signal can pass, therefore there is no turn on thump to be had. Neither does it have a turn off thump.
It does not have a signal turn on, but can safely be turned on remotely by a device used to turn on audio equipment in sections, such as pre amp, amp Cd player etc.
Tubes can be bought just about anywhere, with the buyer beware clause intact. There are many different types, substitutes, and even processes in manufacturing. It can go down the rabbit hole, but that is your choice.
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4krow
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Re: Help deciding what amp to purchase
Reply #15 - 01/09/20 at 17:00:08
 
I want to add that the K horns are over 100db sensitive, point being they will be totally loud enough with 1 watt of input! The Rachel will do quite well by itself, and I see no reason whatsoever to biamp with this sort of speaker sensitivity. For reasons of better quality you might have some sort of argument, but as far as power needs, the point is moot.
In high school, I made set of folded horns of the Klipsch design, and never forgot what 1 watt of bass could sound like. No one could understand why I was making a horn with the driver hidden inside the box. A demonstration baffled them further. 'How can that be?' they wondered.
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Archie
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Re: Help deciding what amp to purchase
Reply #16 - 01/09/20 at 17:02:34
 
In general you might get some soft thumping or other odd sounds during the turn on and turn off.  Steve recommends that volume be kept off for both cycles.  I've never had anything "scary" with my various components though.
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DVDMike
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Re: Help deciding what amp to purchase
Reply #17 - 01/09/20 at 18:42:14
 
Thanks guys for the additional information.  I plan on testing the Rachel (is this a ďfriends reference?) without biamping first.  If there is no need for biamping, great!  

One follow up to the startup suggestion about turning the volume down.  Can you simply turn your volume down for the preamp feeding the Rachel?  Or do you have to use the knobs on her to do this?
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Archie
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Re: Help deciding what amp to purchase
Reply #18 - 01/09/20 at 19:03:17
 
I just turn down my amp and leave the pre alone.  I think the amp is most important since it drives the speakers.
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DVDMike
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Re: Help deciding what amp to purchase
Reply #19 - 01/09/20 at 21:37:44
 
Yikes!  From what I just saw on the website, there are orders backed up going as far back as early October!  Iím not even on the list but there are over 100 units ahead of me.  I figured I might have to wait for a week or so to get my options.  I missed the part about it taking 3 or more months.  S there only one person there who does all of the assembly?
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Re: Help deciding what amp to purchase
Reply #20 - 01/09/20 at 22:56:27
 
There is one for sale here in the classifieds. Grab it and save some money on an already seasoned amp.
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Johnecake
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Re: Help deciding what amp to purchase
Reply #21 - 01/10/20 at 03:28:45
 
Mike congrats on getting into tubes. Itís a whole different restaurant your eating at now. Night and day difference. These amps are hand built to order by artesian craftsman you HAVE to wait for something this nice to be built.Iím waiting on a new preamp myself. Take the time to read all the stuff you can about tube swapping and breakin while u are waiting. Any chance you live in mid NY ur welcome to come see mine.
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DVDMike
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Re: Help deciding what amp to purchase
Reply #22 - 01/10/20 at 04:36:06
 
Iím in Atlanta but grew up in central NY.  No plans to visit any time soon though.
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hdrider
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Re: Help deciding what amp to purchase
Reply #23 - 01/11/20 at 15:36:25
 
Mike - If you can find a used Rachel with the options you want, think about buying it (don't take too long though) and you can send it to Steve and have it checked out giving you the life time warranty. I did that on my CSP-3. You can have him do some upgrades also, depending on what you buy. Yes, a long wait for new gear but always worth it. Buy the time you forgot that you have gear being made, you start getting notices about what stage it's in. Then it's in your listening room. I bet you will pass on the whole bi-amp idea keeping things as pure as possible. Happy listening, Chris.
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DVDMike
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Re: Help deciding what amp to purchase
Reply #24 - 01/13/20 at 22:19:24
 
Well, Iím finally on the scoreboard. And my card was charged 10% of the total cost. So perhaps my delivery would be from mid March to Mid April I guess.

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Re: Help deciding what amp to purchase
Reply #25 - 01/13/20 at 23:30:26
 
It will be worth the wait!
Congrats
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