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Old 3rd January 2003, 09:50 PM   #1
jim is offline jim  Belgium
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Question Lundahl vs. One Electron

Hi,

I'm about to build a SE-2a3 amp.
The only thing missing is the OPT and since my budget isn't that high my choice is limited.
So far I found 2 possible candidates:
1. One Electron UBT-3 ($75 at AES)
2. Lundahl 1664-60mA ($90 at Aquablue)

Does anyone have some experience with these OPT's ????

Jim
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Old 3rd January 2003, 09:53 PM   #2
Joel is offline Joel  United States
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Don't forget the Hammond 1627SE, also in that under-$100 price range.
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Old 3rd January 2003, 11:15 PM   #3
Colt45 is offline Colt45  Serbia
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hammond
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Old 4th January 2003, 01:31 AM   #4
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Hi Jim,

Pound for pound.. dollar for dollar.. the One electron is better than Hammond. The Hammond does sound very good, but it is $99. If you can get the OE for $75, it is the best bet.

I did some comparisons, both distortion and frequency response, and the Hammonds, when they say 30-30K, they mean it. No matter what I did I couldn't get it to extend further. Plus there is about 2-3% even order distortion (through the whole range) that is also plainly visible in a scope, and with NFB will not change.

The OE OTOH go from 5 to 45kHz (in the same circuit!), and the distortion is very low... without NFB! (using the 300B tube, that is. Don't know how it will perform with a 2A3). So, since you may not get more than 4 watts with the 2A3, I would go with the OEs, IMHO.

Now, if you can get Lundahls for $99.... Go for it! Since they are that low I will get them myself to see how they perform.

Gabe
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Old 4th January 2003, 04:44 AM   #5
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Default Re: Lundahl vs. One Electron

Quote:
Originally posted by jim
Hi,

I'm about to build a SE-2a3 amp.
The only thing missing is the OPT and since my budget isn't that high my choice is limited.
So far I found 2 possible candidates:
1. One Electron UBT-3 ($75 at AES)
2. Lundahl 1664-60mA ($90 at Aquablue)

Does anyone have some experience with these OPT's ????

Jim
I have lots of experience with the PP Lundahl OPTs (as well as ITs, chokes etc), and really like them. As for thier SE stuff, I dunno, but if I were to build an SE, I would give them a go personally, based on my previous good experiences with their gear. The downside with Lundahl trannies, and something that's put some people off using them, is that they don't look like traditional transformers and can look ugly on top of a chassis. Mount them underneath, or find a cheap diecast Al housing to put them inside (not potted of course)

What I would caution you about, is shipping costs. USPS isn't a cheap postal service and I would contact AES for a shipping quote first, as it might raise the price significantly. Hammonds have the same problem unless there is a local distributor with decent pricing. Unless you have a high volume account with DHL etc, the costs there will be much higher again. Also get insurance. According to the catalogue, the UBTs are 6.1 lbs before packaging. I've had many good dealings with AES, and Benny at Aquablue has been very helpful.
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Old 4th January 2003, 09:13 AM   #6
jim is offline jim  Belgium
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Hi,

It costs $55 to ship two UBT3's to Belgium.
I also have to pay 21% VAT so that's $120 each.
The Lundahl is $90 VAT included and I can get it myself
since Aquablue is located at only 80km.

Fdegrove.....Where do you get your iron ???

Jim
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Old 4th January 2003, 09:53 AM   #7
dhaen is offline dhaen  Europe
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Quote:
Fdegrove.....Where do you get your iron ???
Frank's much too cool to use Iron..

Quote:
The downside with Lundahl trannies, and something that's put some people off using them, is that they don't look like traditional transformers and can look ugly on top of a chassis. Mount them underneath, or find a cheap diecast Al housing to put them inside (not potted of course)
Benny does some housings for Lundahls.
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Old 4th January 2003, 03:11 PM   #8
Joel is offline Joel  United States
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Quote:
Originally posted by Gabevee
and the Hammonds, when they say 30-30K, they mean it. No matter what I did I couldn't get it to extend further.
What do you mean 'extend further'? There was a brick wall at 30k? What freq, and what wattage was your testing at?

Quote:
Plus there is about 2-3% even order distortion (through the whole range) that is also plainly visible in a scope, and with NFB will not change.
Welcome to the world of output transformers. Again, at what level, what type of signal, and what amount of NFB?

I'm asking these questions, not to give you a hard time Gabe, but to be fair to Hammond - who I think are honest manufacturers with a solid product. A "review" like yours can start rumors, and may not be justified.
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Old 4th January 2003, 04:22 PM   #9
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I happen to like and use Hammond iron all over the place.

But, in the 6L6 and 300B amps I make I used NFB to see if I could bring the response from 30-30K to 15 to as far up as it will go (as everyone knows NFB will do) before inherent capacitance rolls off the high end.

Power... both at 1 watt and full power. Sine wave. 10-24dB NFB.

Strangely enough, with the Hammond 125ESE, the 300B gave an impressive 40-15kHz response from an advertised (FWIW) 100-10K transformer with no NFB. NFB extended it down to about 25 Hz, just before beginning to roll off. Up to about 18kHz.

Quote:
Welcome to the world of output transformers.
While I do expect even order distortion, I also expect a reduction when NFB is employed. With the Hammond 1628, there was little reduction.

However, to their credit, the sound is silky smooth and consistent. They are very well built. I highly recommend them for pentode and tetrode tubes for the UL tap one can take advantage of.

In fact, lately they have even become more asthetic. Hammond now seems to use a different flat black finish, a powder coat, and a smooth protective coat. Very pretty.

Gabe
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Old 4th January 2003, 07:03 PM   #10
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Default OPT

Hi,

Quote:
Fdegrove.....Where do you get your iron ???
Actually before Benny Glass started his business he bought his OPTs from my former company.

At that time (1986-1995) not so much choice for decent OPTs was available and Benny used to buy Tango,Tamura or Rex OPTS as most other DIYers would have.

However,from a commercial and quality standpoint I would recommend the Lundahl especially since Benny seems to sell at even lower prices than Lundahl themselves.
(Dunno how he does it.)

If anything should be wrong with them (normally this should not be the case) you could easily return to Benny.

Importing heavy and delicate items such as OPTs is both expensive and risky.

Another alternative would be Automatic Engineering in Holland .

AE

An of course say hello to Benny from me,
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