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Old 23rd November 2012, 04:56 PM   #1301
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I'm not even sure about what kind of transformers I actually need. Are they normal trafos? I just need one with that output and that's it?
The kind of output transformers talked about in this thread are specifically made for valve amps. This design is push-pull so needs push pull output transformers ie they are not "gapped" as they would be for a single ended amp design. Also this design calls for output transformers having ultra linear taps. Ultra linear taps are an extra pair of taps found on the primary winding and are taken from either side of the centre tap to provide feedback to the EL84's.

This design uses a Hammond 1608. Vendors will tell you it has a primary winding impedance of 8k with ul taps and a secondary winding suitable to connect to different speakers, ie 4ohm, 8ohm.

You don't have to use the 1608. As long as your choice of transformer has a primary impedance of around +/- 10% of 8k. I used the Hammond 1609 (primary impedance 10k) and I think sounds great. Edcor OT's would be another alternative.
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Last edited by Soonerorlater; 23rd November 2012 at 04:59 PM. Reason: spelling
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Old 23rd November 2012, 06:29 PM   #1302
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so you are telling me that ECC83s are compatible with ECC803S? Will I notice any difference in the sound? I have seen ECC83s pretty cheap, but the 803 cost quite a lot (compared to the other).
The ECC83's/12ax7's are pin compatible with the ECC803S and IMHO consider them to be close enough electrically to be a substitute for the ECC803S.

I started off using the JJ ECC803S as used (IIRC) in Ian's original build which I liked but had nothing to compare them with. I then bought a pair of Sovtek 12ax7lps's off of Ebay and liked these also. I then got some Mullard ECC83'S and liked these too. ( Perhaps you can see where I'm going here ) Currently I'm using a pair of Telefunkin ECC83's which I like most of all. I dream of auditioning a pair of original Telefunkin ECC803S's......

Despite the apparent sound differences detected between the various manufacturers of ECC83's/12ax7's and the JJ ECC803S I believe the quality of the output transformer has a greater influence on sound reproduction.
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Old 25th November 2012, 06:20 PM   #1303
Hylle is offline Hylle  Denmark
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I have started to find parts for a 6V6 version for this amp. The 6V6 tubes is driven by sorcefollower coupled mosfets. Just to be sure, does these mosfets need to be put on a heatsink or not? I guess not, since there is no hole to screw in onto a heatsink for this type of mosfet.
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Old 26th December 2012, 07:05 PM   #1304
Hylle is offline Hylle  Denmark
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Have everybody lost interesse for this amplifier? does the mosfets need to be heatsinked?
And can you tell me what is the input sensitivity for this amplifier, I guess there is gain enough so it can be used as an integrated amplifier with a volumecontrol pot at the input?
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Old 26th December 2012, 11:30 PM   #1305
rhone is offline rhone  Australia
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Hello Hylle,
Not lost interest, just happily using their amps after going through the build process!
Mine is a fixed-bias EL84 which uses the MOSFET sourcefollowers. No need for heatsinks as they pass only a few mA.
The amp is designed to be used as an "integrated" by adding a pot, as you guessed.
Rod
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Old 27th December 2012, 04:19 PM   #1306
RKH is offline RKH  United States
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This may be bad form... if so, I won't be offended if the response is 'look it up yourself'... but it would be really helpful if we had a summary posting with links or post numbers to the "best-and-final" designs (schematics) for the Baby Huey. I have tried to keep up with the variants along the way, but have lost focus. It's an age thing for me

It's just taking me a while to get around to the build.

Cheers,
Ryan
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Old 27th December 2012, 04:38 PM   #1307
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Well there is the DIY AUDIO wiki. Which has some stuff. But they are all variations on the "basic" one.
Baby Huey PP EL84 amplifier - diyAudio
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Old 27th December 2012, 04:55 PM   #1308
RKH is offline RKH  United States
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Cheers Bas,
I had forgotten that site and now it is book marked. Do I recall correctly that GingerTube settled on an 6L6 version as his favorite?

Thanks again,
Ryan
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Old 27th December 2012, 08:37 PM   #1309
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Think Gingertube liked the " 6V6 " version when listening to guitar bands.


The 6l6 version is yet to come........
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Old 28th December 2012, 02:14 PM   #1310
Hylle is offline Hylle  Denmark
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Thank you, rhone for answering my questions, so It was as i expected. Now I just need to get started!!
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