hi All, I'm looking for recommendations for tubes to match some 6k6: 8r Danbury 'super' opt's. They are rated at ~30w from memory. sounds easy? Well it's complicated by what it'll be driving, a bass horn using a 16 ohm driver, either a Richard allan cg12 super or goodmans audiom 61. I've driven similar (slightly smaller) horns with the RA 12 using a SE 4p1l and transcendar opt and it sounds good, -3dB at 37hz.
I'm hoping for even better performance with a push-pull output transformer. The RA has a max rating of 10-15 w, they go loud with 1w so that should be fine.
So I'm looking for a tube that has a decent sized cathode and works well with a 6k load per plate. I'd like to avoid dht's as Im planning to fit 6 channels within a reasonablely compact chassis. No tube comes optimally to my mind?!?
Mid and treble will be powered by pse 6e5p amplifiers via minidsp.
Enzo
I'm hoping for even better performance with a push-pull output transformer. The RA has a max rating of 10-15 w, they go loud with 1w so that should be fine.
So I'm looking for a tube that has a decent sized cathode and works well with a 6k load per plate. I'd like to avoid dht's as Im planning to fit 6 channels within a reasonablely compact chassis. No tube comes optimally to my mind?!?
Mid and treble will be powered by pse 6e5p amplifiers via minidsp.
Enzo
Triode wired 7591s should fill the requirement. 6 K is close enough to the 6.6 K "normally" used with 7591s. An added plus is the ease with which the 7591 family is driven. Circuitry that works with "12" W. tubes, like the 6BQ5/EL84 and the 6V6, also works with 7591s. 😉
Thanks for the 7591 recommendation, looking at the data sheet it gives 6k6 p-p, so 3k3 per plate, I'd plan to connect my 16r speakers to the only available tap at 8ohms so a reflected impedance of 13k p-p.
I used these opt with some 6av5 triode strapped with a pair of d3a triode strapped and a ccs under the d3a for a very low distortion 8w, if only the opt had 16ohm taps. If I like how it all sounds I'll get some dedicated opt's made but for now I'm trying to work out a simple design to cobble a proof of concept. I have a load of dht's that would work but I'm not going there having just built the choke input coleman regd filiment supplys for my 833a!
I used these opt with some 6av5 triode strapped with a pair of d3a triode strapped and a ccs under the d3a for a very low distortion 8w, if only the opt had 16ohm taps. If I like how it all sounds I'll get some dedicated opt's made but for now I'm trying to work out a simple design to cobble a proof of concept. I have a load of dht's that would work but I'm not going there having just built the choke input coleman regd filiment supplys for my 833a!
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