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Old 21st August 2008, 08:39 PM   #41
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Location: Newark, DE
Yes, I definitely intend to try it without UL and/or feedback. I suspect disconnecting the feedback is going to make the overall gain go up, which isn't something I necessarily want. Will disconnecting the UL tap affect the gain? I also have some New Sensor KT88 tubes which will probably get tried out this weekend. I finally found my Telefunken ECC81. I don't have strong feelings about it one way or another. It might be a little quieter (less noisy) than the GE tube I had in previously.

By the way, Dave, your chassis work looks fantastic. What type of wood is that? I want to learn how to make through dovetail joints. I'm afraid I'm not much of a woodworker.

Someone asked, so here's a (nearly) complete list of the parts I used. The list is probably missing something, so check carefully if you are going to use it yourself. I'll also attach my last layout template. If I had to do it again, I'd use a bigger chassis and give myself more room.

http://tubelab.com/
Circuit board: Simple SE

http://transcendar.com/
Output transformers: Transcendar SE 5K, 8 ohm, 10 watt
(request optional UL tap at time of order)

http://tubesandmore.com/
Power transformer: Hammond P-T374BX
Filter choke: Hammond P-T159Q

http://tubedepot.com/
PC mount sockets: 3 octal, 1 nine-pin
(could also source from tubesandmore)

http://digikey.com/
Circuit parts:
IXCP10M45S-ND (qty 2)
P7442-ND
P7451-ND

http://mouser.com/
Circuit parts:
140-PM2A474K|1
647-UPW0J152MPD|2
75-715P600V0.22|2
647-UPW1J152MHD|2
280-CR5-150-RC|1
283-150K-RC|1
281-10K-RC|1
282-150K-RC|1
271-220-RC|2
271-220K-RC|4
271-100-RC|4
271-330-RC|2
283-10K-RC|2
280-CR5-560-RC|2
282-100-RC|2
271-1K-RC|2
164-19B2-EX|2
161-0251-EX|1
161-0252-EX|1
103-R13-135B-02R-EV|1
534-1452B|5
534-744|6
532-530714B00|2
532-4880SG|2
651-1715022|9
651-1715035|3

Chassis plate: aluminum, 14" x 9"
Box frame: 2x3 pine, 2pc 16", 2pc 8"
Miscellaneous #8 hardware, washers, etc.
IEC connector, fuse holder: salvage from old equipment
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Old 21st August 2008, 11:46 PM   #42
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That's pretty much my list. I'll be starting my Simple SE as soon as all the parts are in hand. The Mouser stuff is here or on the way (short backorder on a couple of items). Digikey stuff is on the way. Ebay motor run capacitor is here (didn't see that on your list, BTW). When George resurfaces, I'll get the board ordered.

I'm curious as to how you arrived at your power transformer choice. I've not been able to pin down what the right size is. There are so many discussed on the Tublelab web site and in the threads here that I find myself second guessing each time I think I've figured it out.
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Old 22nd August 2008, 01:18 AM   #43
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When George resurfaces, I'll get the board ordered.
I'm back. I had surgery on Tuesday, and must go back again next Tuesday but I will make at least one or two trips to the post office each week.

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I'm curious as to how you arrived at your power transformer choice.
Most builders go for the 750 VCT transformer since that offers the most power output and works well with most tubes. That means the Allied 6K7VG (cheapest and really a Hammong 274BX in disguise) The Hammond 274BX, and the Hammond 374BX which is slightly larger than the others and reportedly of better construction. The 374BX also has 220-230-240 volt taps.

The 5K Transcendars are a good choice for OPT's as are the Edcor CXSE 25-8-5K. I think that I like the Edcors better, but they are more expensive, and significantly larger. Haven't tried James since they are hard to get.

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I can't imagine someone not perfering tube sound to SS but then with movie soundtracks it could have something to do with DAC.
I find that it is not uncommon that many young people have not learned how to critically listen to the music. I have loaned tube amps to a lot of people (mostly young engineers). A significant number prefer the sound of a multi gigawatt wall shaker. Often they prefer MP3's to vinyl. Musical preference plays a big part. The tube amp doesn't offer much sonic improvement to a lot of hip hop music.
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Old 22nd August 2008, 03:16 PM   #44
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Quote:
Originally posted by tubelab.com

I find that it is not uncommon that many young people have not learned how to critically listen to the music. I have loaned tube amps to a lot of people (mostly young engineers). A significant number prefer the sound of a multi gigawatt wall shaker. Often they prefer MP3's to vinyl. Musical preference plays a big part. The tube amp doesn't offer much sonic improvement to a lot of hip hop music.

Hope you're doing ok...

I agree with this, there are a lot of people who are not very discerning about audio reproduction, but I've had speakers that were happiest when used with very powerful amps.... these were the old Mirage bipolar speakers, which featured very complicated crossovers. The amps that worked well driving these speakers sound pretty bad driving my single drivers.

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Yes, I definitely intend to try it without UL and/or feedback. I suspect disconnecting the feedback is going to make the overall gain go up, which isn't something I necessarily want. Will disconnecting the UL tap affect the gain?

By the way, Dave, your chassis work looks fantastic. What type of wood is that? I want to learn how to make through dovetail joints. I'm afraid I'm not much of a woodworker.
cfb reduces gain, but not by a whole lot, UL is noticeably louder than triode at the same volume setting.

Thanks...The wood I used was figured maple and walnut crotchwood for the corners. I don't use dovetails too much, but I have a Keller jig that does a pretty good job with them, only $80 through Amazon:

http://www.amazon.com/Keller-Dovetai.../dp/B000022420

Dave
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Old 22nd August 2008, 03:23 PM   #45
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Originally posted by Davec113
cfb reduces gain, but not by a whole lot, UL is noticeably louder than triode at the same volume setting.
That sounds encouraging. I'll definitely give triode a try, probably tonight.

On a side note - has anyone heard a very, very low level whistling/jingling type noise coming from their Simple SE? I swear it isn't coming from the output transformers, and it happens even when my preamp is switched off.
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Old 22nd August 2008, 03:42 PM   #46
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Ty,

I've noticed jingling, ringing, and sometimes pinging depending on the tubes, but I hear nothing with the current configuration. I've had a microphonic 12AT7 that made fun sounds. The 6BG6GA's and 6679 preamp tube I've got in place now are dead quiet. No feedback, triode.

George, hope you're keeping dry down there.
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Old 22nd August 2008, 04:50 PM   #47
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George, hope you're keeping dry down there.
Most of the wet stuff has passed us by, without harmful effects. Friends to the north (Orlando, Mebourne area) were not so lucky. They are still getting soaked. A friend of mine has 2 inches of water in his warehouse.

Quote:
On a side note - has anyone heard a very, very low level whistling/jingling type noise coming from their Simple SE?
Does this happen with no music playing? Many tubes do emit a clicking or pinging sound as they are warming up due to thermal effects. Hammond and other power transformers can buzz or hum and even cause the chassis or other objects to vibrate, but I can't think of much else that can make sound.
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Old 22nd August 2008, 05:52 PM   #48
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Quote:
Originally posted by tubelab.com
Does this happen with no music playing? Many tubes do emit a clicking or pinging sound as they are warming up due to thermal effects.
It happens regardless of whether or not the music is playing. The tubes are well warmed up, and have been that way for several hours.
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Old 22nd August 2008, 07:50 PM   #49
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Originally posted by tubelab.com
I'm back. I had surgery on Tuesday, and must go back again next Tuesday but I will make at least one or two trips to the post office each week.
Man, you and yours have had your share of medical "adventures". Here's hoping that it turns around, and soon.

Quote:
Most builders go for the 750 VCT transformer since that offers the most power output and works well with most tubes. That means the Allied 6K7VG (cheapest and really a Hammong 274BX in disguise) The Hammond 274BX, and the Hammond 374BX which is slightly larger than the others and reportedly of better construction. The 374BX also has 220-230-240 volt taps.

The 5K Transcendars are a good choice for OPT's as are the Edcor CXSE 25-8-5K. I think that I like the Edcors better, but they are more expensive, and significantly larger. Haven't tried James since they are hard to get.
The Allied 6K7VTG it is then. As this is my first foray into tube sound, I'm inclined to cut one corner though. Based on your reviews of the smaller Edcor OPT's I'm going to try them (the XSE's) first. I've got some very efficient full-range speakers that should be a reasonable match for a SET amp. If I like what I hear, larger OPT's will be a must to satisfy my jones for solid base performance.

This is going to be an expensive habit, I fear.

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Old 22nd August 2008, 08:37 PM   #50
hdlcx2 is offline hdlcx2  United States
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I'm back. I had surgery on Tuesday, and must go back again next Tuesday but I will make at least one or two trips to the post office each week.
Same here George, I hope things pick up for you and yours, soon.

I am also in the process of beginning to place orders for parts.

My current speakers are 4ohm impedence. I have been considering the Edcor's also and was wondering if I should order the CXSE 25 - 8 - 5K or the CXSE 25 - 4 - 5K ?

I would hate to order the wrong ones but would the 8ohm work anyway and be a better choice?

Cheers

Will
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