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M-T's Running Temperature and input "attenuation" (Read 1724 times)
Hank
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M-T's Running Temperature and input "attenuation"
10/02/12 at 20:00:10
 
Being homebound for a while, I'm getting a chance to run through my collection of 2000+ CD's. That means I'm running the amp from 2 to 5 hours a day.  By that time, the PT's are really hot, just a bit too hot to touch.  I'm running with Tung-Sol 6L6CG-STR's and 12AU7's with the stock rectifiers and VR's (0A3's and 0C2's).  Just asking if that's normal.

Running the M-T with  my CD deck, setting the volume levels for comfortable listening will be less than 20% of full range.  I used the CSP2 or my DIY Zenhead to control the input and get the M-T's volume range up to about half range.  Is this an acceptable work-around or am I defeating the amp's sonic capabilities?  My primary speakers are rated at 96dB 1W/1M single driver in bass-reflex cabinets.

Gotta say this amp sounds great, none the less.

Regards,
Hank
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Lon
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Re: M-T's Running Temperature and input
Reply #1 - 10/02/12 at 20:09:41
 
Don't have an MT, but I don't really feel that the temperature will be an issue.

I would experiment "riding the gain" (have you seen Steve's ideas about this?) by varying the gain input level on the MT and the output of the CSP2. With some components I've preferred to add a little native compression to the sound by having the amp input lower, say 30 to 70 percent, and using higher output from the preamp. With my current sources for most I prefer to have my Torii all the way up and controlling my volume directly from the preamp. This seems to me to let the amp be all it can be, and the resulting open and wide sound is just right for me.

It's all about how it sounds . .. and with Decware amps we really have options!
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« Last Edit: 10/02/12 at 20:10:42 by Lon »  

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Steve Deckert
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Re: M-T's Running Temperature and input "attenuation"
Reply #2 - 10/03/12 at 01:31:58
 
The 6L6's are drawing a bit more current than the amplifier would like to see during an all day gig.  Going back to the 6V6 it is possible to run the amp 24/7.

Steve
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Hank
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Re: M-T's Running Temperature and input "attenuation"
Reply #3 - 10/03/12 at 01:46:41
 
Hi, Steve, Lon

Thanks for the suggestions.

Lon, using the M-T with the CSP2 as a pre-preamp, I set the M-T controls about 50% and adjust the listening level with the CSP2.  That seems to let the M-T's "punch" come through.

Regards,
Hank
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Decware SE84DIY amp, TABOO, CSP2, ZenHead, Mini TORII SE-X. SE84CKC SuperZen
Visonik HIFI DD-8300 Turntable.
Bellari Tube Phono Preamp
Technics SL-PD5 CD Player
Tekton 8.1en Speakers
Tekton 4.1 Desktop Speakers
Grado SR60i phones
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Lon
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Re: M-T's Running Temperature and input "attenuation"
Reply #4 - 10/03/12 at 01:49:18
 
Cool! Whatever sounds best!
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Decware:ERR,HR-1,ZP3,CSP2+,Torii Mk III,PS Audio PWT+DS,PowerBases,PPP,AC-12 pcs, Denon DVD-A1UDCI, Rega RP3 +TTPSU,white belt+Exact2, VooDoo Cable:Stradivarius, Ultra Linear+Evo ICs, Iso-Pods,Mapleshade:Double Heiix Plus,Samsonv2+v3 +4" platforms,Herbie's Iso-Cup
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Hank
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Re: M-T's Running Temperature and input "attenuation"
Reply #5 - 10/03/12 at 15:09:34
 
Steve suggests running the MT all day with 6L6's may be drawing a little more current than the amp likes.

If data sheets for compatible tubes  are available, what do I look for to avoid high current needs like the 6L6's?

Regards,
Hank
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Decware SE84DIY amp, TABOO, CSP2, ZenHead, Mini TORII SE-X. SE84CKC SuperZen
Visonik HIFI DD-8300 Turntable.
Bellari Tube Phono Preamp
Technics SL-PD5 CD Player
Tekton 8.1en Speakers
Tekton 4.1 Desktop Speakers
Grado SR60i phones
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Les Lammers
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Re: M-T's Running Temperature and input "attenuation"
Reply #6 - 10/04/12 at 15:51:55
 
Hank,

FWIW, stick with 6V6's for extended listening sessions and you will be fine.

Les
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Rivieraranch
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Re: M-T's Running Temperature and input "attenuation"
Reply #7 - 10/04/12 at 22:49:03
 
If you really want to feel some heat stick some 6Y6's in there.
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