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Interstage transformer upgrade on interstage monoblocks, plus a driver question

130.226.56.2
Posted on September 8, 2009 at 00:24:58
Frihed89
Audiophile

Posts: 8435
Location: Copenhagen
Joined: March 21, 2005
 I see on the web page that AN Double C-Core OPTs in the 300 (single SET) or 305 (double SET) can be substituted for the stock OPTs. What about the proper AN double C-Core substitutes for the interstage transformers? I am not sure about the values for the 6SH7 driver in relation to the 6SN7 driver. Could one use a trans 013 or 014, or both?

And why was the 6SH7 selected when the 6SN7 works so well as a driver on other models? I wonder what you'd have to do to run a 6SN7 instead? I've looked at several electrical sheets on the 6SH7, but couldn't find a page that allowed an easy comparison (for me) of the 6SH7 to the 6SN7GT
"What did the Romans ever do for us?"
RE: Interstage transformer upgrade on interstage monoblocks, plus a driver question, posted on September 9, 2009 at 09:12:55
DougE
Audiophile

Posts: 170
Joined: March 23, 2001
 I use the TRANS-013/01-AN interstage on my single 300b monos. These are the Ultra HiB interstage. I chose these over the 014 series after an exchange with Andy Grove. Not sure why the 6SH7 was chosen exactly, instead of the 6SN7. But if you went with the 6SN7 you'd be wise to find out from AN what tx would be apprpriate.

Doug

NIce and a question more, posted on September 9, 2009 at 23:45:46
Frihed89
Audiophile

Posts: 8435
Location: Copenhagen
Joined: March 21, 2005
 Nice. £1270 for 2. It could be worse. MY experience with output transformers, is that the upgrades are well worth it.

An audio friend suggested changing the stock interstage transformer first and the trying it with the stock OPT and then upgrading the OPT later. His reasoning is that changes in up-stream components have the biggest impact, next to changing both.

Did you try that? And then add the double C-core OPT later to divide the total effect into its partial effects?



"What did the Romans ever do for us?"
RE: NIce and a question more, posted on September 10, 2009 at 06:56:07
DougE
Audiophile

Posts: 170
Joined: March 23, 2001
 The reasoning that upstream makes more difference could be true, and I did run the amps with the stock ccore from AN Kits before I changed to the UHiB factory IT. There was a difference when I changed to the factory. Frankly, I don't know if the cost is justified as when I got them two years ago they were substantially less expensive!

Also, I've upgraded all the caps to BG wkz which made a very substantial improvement. Hard to quantify changes, so I'll just say that the caps were an improvement at least in the same league as the tx.

For me, the decision to go UHiB was based around what I was willing to pay at the time for the tx. Likely they are overkill as I'm using the regular HiB ouput on the monos and the HiB preamp tx in my L3 and I believe my 4.1xbal dac uses regular HiB as well. At any rate, the IT on the monos shouldn't be holding me back, sonically!

Doug

RE: Interstage transformer upgrade on interstage monoblocks, plus a driver question, posted on September 9, 2009 at 11:50:48
Frihed89
Audiophile

Posts: 8435
Location: Copenhagen
Joined: March 21, 2005
 Thanks.

I just found out that the 6SH7 is there because of the interstage transformer.. The 6SN7 wouldn't work. The 6SN7 works on the AN Quest and Conquest amps because the 300Bs are not direct coupled on both ends and a cap does the connecting of the 6SN7 to the 300B.
"What did the Romans ever do for us?"
RE: Interstage transformer upgrade on interstage monoblocks, plus a driver question, posted on September 10, 2009 at 03:56:09
Exorcist
 I also use a Lundahl LL1660 C-Core, which can wired as 1: 1.25 or 1: 2.5
I can play around WE417/437 as driver which needs a higher mA from the interstage primary

The original interstage is 1:1 correct?, posted on September 10, 2009 at 06:40:38
Frihed89
Audiophile

Posts: 8435
Location: Copenhagen
Joined: March 21, 2005
 And you changed the driver and that way you could use the different in:out ratio? How was the improvement? The Lundhal is cheaper, I assume?

I am not at all familiar with the WE417/437 (or the 6SH7 for that matter).
"What did the Romans ever do for us?"

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