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Old 23rd January 2005, 11:14 AM   #1
kmj is offline kmj  Sweden
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Default amplimo budget outputtransformer

Hi, is there anyone who can make a statment about this transformer?

i'm still looking for some outputtrafos for a pair of 4xel34 or kt66 PP poweramps. There are som many different brands to choose from and you have to start somewhere
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Old 23rd January 2005, 02:11 PM   #2
kmtang is offline kmtang  Canada
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I just have the 3.5K SE OPT from Plitron which is same as Amplimo ones. I am very impressed with it's quality. I have not heard about the other OPT from them but I believe they must be good.

By the way, there's no such thing as best or perfect in this world. We are all here trying to out a little bit of improvements from our amps by trial.

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Old 25th January 2005, 01:49 AM   #3
effindi is offline effindi  Singapore
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GOt not much knowledge on the output trans but have 2 question for you:

1. Can you share your circuit for the 4x el34 kt66... sounds like it is going to be a powerful tube amp. I have been scouting around for such high power tube amp.

2. I have a local winder that can do custom trans.. how should I tell them if I want them to custom made the output trans for your project?

-= It's the inner ear that hears =-
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Old 25th January 2005, 07:47 AM   #4
kmj is offline kmj  Sweden
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1: sure, here's the Article with parts, complete schematics and some other stuff

2: just check for the transformer "pat4002" and give the specs to the winder.

by the way, there's a 100w version in the same article
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Old 26th January 2005, 07:25 AM   #5
kmj is offline kmj  Sweden
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To answer my own questions, the xc462 is not compatible to the linked cirquit and the bandwidth is very restricted compared to the pat4004. The PAT4004=VDV3070 sound is easy, unrestricted and deep, while in the XC462 the sound is good, but not with high-end resolution. (got a mail from the designer)

But using kt66 was a good idéa and also to change the screen grid resistors from 150 Ohm to 1 kOhm (1Watt) to prefent any oscillation.
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