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Hi PEAKABOO, This Phil in London, Uk. How you doing. Long time no speak. As I mentioned above I still have an Xforce 16-pill that Dennis modded with his bias design. I intend to get this out of storage and fire it up. In fact it's never been fired up so still new, if you can call...

A questions for the experienced amp designers here. My Metron HF 8 device amp has a single bias adjust for the four push-pull pairs of transistors. Am I correct in that if all transistors are perfectly matched or at least share the same batch code then this single adjustment is probably...

The amp that Dennis modded for me is a 16-pill X-Force and I still have it. Remember though it's 11m only. Phil Unit 148

:D I wish it were just the driver, and it's more than 15 years. I think many of the Metron's did not have the 10m switch position as your rules as you know do not allow operation above 25MHz. There was a simple mod to get these to work on 10m in the 15m switch position. I own two of...

Just realised my avatar is in another forum :redface: Phil Unit 148

I was getting my hopes up on these plastic fet's but you're painting a poor picture re their capabilities. I'm very familiar with the even cheaper IRF's as we used to sell a 40w FM PA with a pair of 510's in a broadband design covering the FM broadcast band 88-108MHz. I am no designer and...

I imagine with such a small die it's imperative to have perfect finished heatsink plus fan cooling to keep things under control. You can push RF fet's as I'm sure you know. We have seen a genuine 1Kw out of a pair of these at work...

http://www.rfparts.com/pdf_docs/ERF7530%20Datasheet%20-%20Rev2%200.pdf The datasheet quotes 75W pep at 12.5V so I'd expect around 100-125 at a solid 14V with everything optimised. Shame these things have such low gain. Phil Unit 148

Here;s a selection of FET homebrew amps: www

Toll, Good to hear you're still out there keeping those 10 ohms warm. Is Dennis (IL) still around? Phil London, UK

Can anyone tell me if there is a 900W FET mobile unit on the horizon? I think that would be an ideal box for a 100W ham or 11m transceiver. Tnx Unit 148