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Old 19th February 2013, 05:35 AM   #11
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Originally Posted by kaos2088 View Post
Really only went with SSE cause it was a simpler design and easier to build. As I research this more, those don't seem like good reasons, the TSE doesn't seem too much harder to build. The Omens are 97dB so they should be able to handle those tubes fine.... Thinking I should build the TSE now..
Hello
I run one of my speakers (Fostex 167E in MLTL crossover less @ 94dB) with my SSE using El34. No problem and still a lot of power to spare(room is 22 feet by 24 feet by 12 feet).

abe
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Old 19th February 2013, 10:25 PM   #12
pso is offline pso  Spain
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Hi Kaos2088,

A good substitute for the 2SK3563 is the AOT1N60 (Digi-Key part number 785-1184-5-ND), I read somewhere as was recommended by George.
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Old 19th February 2013, 11:33 PM   #13
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IIRC, I'm running 2sk3564's in my 300b TSE. They are still available from digikey and have a 900V drain to source voltage rating (the 2sk3563 has a 500V rating).

As Russ mentioned, there are a few threads here discussing appropriate mosfets for the TSE.
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Old 25th February 2013, 09:44 PM   #14
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Alrighty, gotten a lot of new information and need help understanding. So I had a convo with ZU and they told me that while the speakers are rated at 12 ohms, they actually act more like 16 ohm speakers. Additionally the speakers don't need a lot of electrical feedback so I should aim for a damping factor of 2 or 3.

I took this information to Jack over at EP and got a quote of $200 each for 5K to 16ohm OPTS. Little more than I was hoping for but I'm sure they would sound amazing.

I see two options right now:
1) the EPs
2) James JS-6123HS EBAY


I had hoped I could use these: 5K or 3.5K into 8 ohm transcendars EBAY

But given this new information I don't think they will work very well with my speakers. The 3.5K would actually look like 7K.

Now as for the damping factor, are there any modifications that I should make to the circuit to take this into consideration? Don't see too much info about this in the forum.
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Old 28th February 2013, 11:11 AM   #15
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I'm using Omen speakers with SSE and my other SE amps. My Transcendar OPT is 5K primary and 1st thing I noticed with the omen's is that the volume needs to be turned higher, compared to my 8 Ohm Usher speakers. Decision to go with 3.5k primary is good idea. The SSE and all my other SE amps have to be cranked at max with omen's. While it plays just as loud with the Usher's at much lower volume. Although I must say If you go with 5K OPT(and making the primary look like 7K), the sound will be much much cleaner v/s 3.5K(making around 5.5K). And because of Omen's higher sensitivity, the lower Watts per channel does not really matter. I can still play my SE amps at ear splitting levels on the Omen's.

Regardless, you are in for quite a surprise when you pair up your Omen's with a DHT SE amp like the TSE.

Last edited by imnewbie; 28th February 2013 at 11:24 AM.
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Old 28th February 2013, 02:53 PM   #16
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Quote:
Originally Posted by kaos2088 View Post
I see two options right now:
1) the EPs
2) James JS-6123HS EBAY
FWIW, I'm running the James 6123's in my 300B TSE and it's presently my favorite amp. I'm using Tang Band W8-1772's in Half Chang Enclosures (95db). The James is nice because it offers several impedance taps.......and is potted and comes in black or champagne I'm using the 5K taps at 360V and 60ma IIRC.

I also have a 45 version of the TSE running Electraprint 5K transformers.

I had a pair of trancendars but sold them before I built anything with them but they are well regarded for a mid-priced transformer. Gery at Transcendar builds them with and without UL taps; for a TSE build there is no need for UL taps.

As far as damping factor goes, it works like this:

Damping factor is the relationship between the amp output impedance and the speaker impedance. Amps with low output impedance are said to have a high damping factor since the low output impedance driving a high speaker impedance allows the amp to have great control over woofer cone movement, since the amp's low output impedance allows the amp to provide the current when the speaker calls for it.

The addition of feedback in an amp does several things, it increases bandwidth, reduces gain, and reduces output impedance. So amps with lots of feedback (think SS amps) have a high damping factor due to their low (sub 1 ohm) output impedance. The damping factor is simply the ratio of the speaker impedance divided by the amp's output impedance. Some high feedback SS amps have DF numbers in the 100's into typical 8 ohm speakers.

A SET tube amp without feedback (like the TSE) will have an output impedance of a couple of ohms, so you will end up with a low DF, say around 4 or so, maybe around 6-8 with your speakers (these are guesses on my part-Tubelab George probably has a more quantitative number). This means that the (relatively) high output impedance of the amp has less control over the woofer cone, resulting in more perceived bass. Sometimes, very low DF ends up with "loose" or "wooly" bass depending on the amp/speaker combo. Conversely, driving some speakers (typically full range speakers) with a high DF SS amp results in very thin, tight/weak bass. I definitely notice this with my 1772's if I drive them with a high powered SS amp.

I wouldn't think that you would need any circuit mods to the TSE to drive your speakers except for picking the correct transformer primary impedance to match well with your speakers impedance.

Last edited by boywonder; 28th February 2013 at 03:01 PM.
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Old 28th February 2013, 03:29 PM   #17
cotdt is offline cotdt  United States
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I thought Zu Omens were meant to be efficient? Because those Ushers are extremely inefficient, and they are louder than the Zu's?
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Old 28th February 2013, 09:23 PM   #18
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Originally Posted by cotdt View Post
I thought Zu Omens were meant to be efficient? Because those Ushers are extremely inefficient, and they are louder than the Zu's?
It has nothing to do with efficiency. It's just that 5K/8 ohm OPT used with 12 Ohm speaker makes the primary look like 7K, which lowers the WPC. However, using 8 ohm speaker with same 8 ohm tap OPT will keep the primary at 5K. This has already been discussed here in earlier posts of this thread.

Another thing is, it's common misconception that inefficient speakers suck with SE amps. IF the 86-89db speaker have flat frequency response then it can too pair nicely with an SE amp in a small or medium sized rooms. BUT still I use the Omen speakers for my SE amps because the sound is much cleaner because of higher load resistance. My Millett Jonokuchi amp sounds cleaner than any other SE amp I have, since the 7K load probably looks like 9K to 13EM7 tubes.

Last edited by imnewbie; 28th February 2013 at 09:31 PM.
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Old 28th February 2013, 09:39 PM   #19
rknize is offline rknize  United States
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I have the One Electron UBT-2 in my TSE. They are excellent transformers and have 4/8/16 tapped secondaries.

Transformer - One Electron, Output, 4800 to 16/8/4 | Antique Electronic Supply
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Old 2nd March 2013, 02:51 PM   #20
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Originally Posted by imnewbie View Post
Regardless, you are in for quite a surprise when you pair up your Omen's with a DHT SE amp like the TSE.
I hope you mean I'm in for a good surprise. Only heard excellent things so can't wait until I can try them out.

Got my board in the mail, which was the only thing holding me back from ordering everything else.

Hadn't looked at the UBT-2 , but thats definitely another option. Slightly less expensive than the other two, so thats always a plus.
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