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In the Forum: Melquiades Amplifier
In the Thread: Planning my DSET
Post Subject: You will see.Posted by Romy the Cat on: 5/28/2015
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 anthony wrote:
My interest is mainly in the 10Y/801A/VT25 tubes on one hand and the 45 on the other hand.  The YO186 also interests me a lot especially after reading your impressions of it in your circuit and system, but it is a very difficult tube to get a hold of and is quite expensive.  The 10Y etc. seem relatively reasonably priced and quite available, however I don't have a ready-made circuit or even knowledge of how they work with Macondo, so I am tempted to just follow your DHT lead with the 6E6P and DHT MF, especially considering that I don't want to be testing/developing amplifiers for much longer than I have to even if I may end up with a better result going the longer route.  

There are tons of very cool DHT out there and for sure 10Y is one of them. Mind you that all “publicity” of good DHT come from full-range amplification and no one know how this particular DHT will behave with your specific drive in DSET configuration. I do hear your concern about you not wiling “to be testing/developing amplifiers for much longer than I have to”. That is VERY valid point.
 anthony wrote:
My primary concern about a DHT driver is the low gain of those tubes (10Y is about 8x compared to 6E5P of 32x) and having to use an input transformer to improve gain and its effect on the crossover for MF.

Well, do not discard the  3-stages topology for MF. You need to understand that 6E5P in a way unique for 2-stages scenario and no transformers, when you need a lot of gain and a lot of voltage on grid to keep the tube in class A. Pretend that you have some kind of 12AX7 at input, this tube 0.5V bios will be very fast flooded by input voltage and you will be obligated to rise the cathode on feedback.
 anthony wrote:
I thought I might be pushing the limit.  Do you think it would be possible to increase gain by using an input transformer on the DSET ULF channel to boost signal level?  I am not sure how this would mess with the low-pass filter. Otherwise I could add a decent SS amp or maybe even push-pull 6C33C. 

I think when you have a full range Milq and drive everything from it you will see what is going. The array will be your less sensitive load and you will be calibrating everything from the LF.

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