Chris Rogers HFA TL Upgrade?

rotaspec · 28th January 2010, 12:53 AM

The Hi-Fi Answers transmission lines that I have were fairly high end when I built them in the mid 70's. And I have certainly had my money's worth out of them over the years.
However, I am sure designs have moved on somewhat over the last 30 years or so. And they don't seem a good match to my little tube amps (10W max), as they are very underdamped on bass. Bass is fine on SS amps, but the treble is typically harsh.
As I have to pull the boxes apart to repair/re-cap the crossovers, I am considering options for a full rebuild.
Are there any modern designs that would suit the venerable KEF B139, B100, T27, and Coles 4001G drivers.
Or would I be better off just doing the crossover repairs and going for a whole new design/driver combination.
Thoughts anyone?

Gary

planet10 · 28th January 2010, 02:10 AM

Perhaps a bit more radical idea... take the B139 and put them into one of the versions )or a variation) of the modern TL we designed. Transmission Line Speakers

Then sell the B110s, T27, and Coles (maybe keep the Coles as a supertweeter, depending on your FR choice). Get yourself a suitable FR. Do a bi-amped FAST. (a good place to start on that last term). Tubes on the top, SS on the bottom.

dave

rotaspec · 29th January 2010, 02:43 AM

Thanks Dave.
I am in the midst of re-capping the crossovers, and having done one cabinet the difference is dramatic. Much happier on the tube amp now, so I guess the caps were a problem. Bass is tighter, and the rest of the range is far clearer.
I think I'll keep these as "classics" and look at a ground up build with new drivers.

28th January 2010, 12:53 AM	#1
rotaspec diyAudio Member Join Date: Nov 2007	Chris Rogers HFA TL Upgrade? The Hi-Fi Answers transmission lines that I have were fairly high end when I built them in the mid 70's. And I have certainly had my money's worth out of them over the years. However, I am sure designs have moved on somewhat over the last 30 years or so. And they don't seem a good match to my little tube amps (10W max), as they are very underdamped on bass. Bass is fine on SS amps, but the treble is typically harsh. As I have to pull the boxes apart to repair/re-cap the crossovers, I am considering options for a full rebuild. Are there any modern designs that would suit the venerable KEF B139, B100, T27, and Coles 4001G drivers. Or would I be better off just doing the crossover repairs and going for a whole new design/driver combination. Thoughts anyone? Gary

28th January 2010, 02:10 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Perhaps a bit more radical idea... take the B139 and put them into one of the versions )or a variation) of the modern TL we designed. Transmission Line Speakers Then sell the B110s, T27, and Coles (maybe keep the Coles as a supertweeter, depending on your FR choice). Get yourself a suitable FR. Do a bi-amped FAST. (a good place to start on that last term). Tubes on the top, SS on the bottom. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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29th January 2010, 02:43 AM	#3
rotaspec diyAudio Member Join Date: Nov 2007	Thanks Dave. I am in the midst of re-capping the crossovers, and having done one cabinet the difference is dramatic. Much happier on the tube amp now, so I guess the caps were a problem. Bass is tighter, and the rest of the range is far clearer. I think I'll keep these as "classics" and look at a ground up build with new drivers.

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