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In Reply to: RE: +1 posted by horny on June 12, 2015 at 09:10:52
A Duplex is sort of a 515 woofer -- sort of. They're less filling, and they taste great.
Big fan, am I.
Just sayin'...
PS I don't - exactly - disagree about thr 45 and the 2A3... I am not a fan of the 300B's sound, by and large. Gary's SE 211 amp does have the flesh and blood immediacy thing goin' on, though, big time, IMO.
I won't say anything against direct coupling (vs. cap coupling) except it's a little too tricky for a Neanderthal like me to implement.
all the best,
mrh
Follow Ups:
mhardy,
There is nothing quite like a two stage DC amp on ALTECs, IF the amp is done really well,.... and very very few are.
I have written a guide I can send you, so that you could convert to such a topology. Is there any way we can get in touch email wise, so I can send you my write up as an attachment?? If you don't build it, it will still be an interesting read for you.
I start with Loftin White, and then proceed to a modern approach.
Jeff Medwin
Oke i see ...duplexes.
i have the Altec 604 here
and i am still voicing an altec vott with 515 woofers and 1505b horns with 288 drivers.
this was a project i started a month ago
i like the 300b sound on the altec.
i have also 45 and 2a3 amps but i find these to neat and polite for my taste.
i like the balls the big tone and the grunt from the 300b on the 15 inch woofer.
but the 45 and 2a3 amps are also great amps its just my taste and preference.
If you had the right power supply, proper wiring and right bypassing of caps, there is no way you would listen to a 300B over a 2A3. Just saying'Jeff Medwin
Edits: 06/23/15
OK :-)
here is a picture of the vott and on the right right the 300b amp
his are real Altec horns, though (tar filled); those appear to be modern wooden replicas, no?
all the best,
mrh
Yes but this wooden replica's sound much better then the originals.
i have also aluminum altec horns.
Did you buy them or make them?
Dave
hello Dave
i buy them from Markus Klug in Germany he build these wonderfull horns http://klughoerner.de/Haupt/about/
The less than ideal design and construction of your 45 and 2A3 amps is your real audio problem. Altec 515B, etc is superb. You just have an amp problem, like most people do !!
Jeff Medwin
I don't have a problem Jeffwhy do you think i have a problem ???
Edits: 06/21/15
Hello,
You stated this :
"i have also 45 and 2a3 amps but i find these to neat and polite for my taste.
i like the balls the big tone and the grunt from the 300b on the 15 inch woofer. "
This wording above tells me you are probably listening to a conventionally-built 45 and 2A3 amps, with all the errors in design people usually make!!
Some of us know how to build a 45 and 2A3 amp so it will be vivid, dynamic as all get out, and fabulous on bass on a high efficiency fifteen in woofer. But alas, 97% of the public does not know how to do this !!!
Sonically, any 45 or single plate 2A3 ( AVVT, EML, JJ2A3-40 ) is a superior tube to a 300B. But, I am assuming an ideal amp build in all cases, which it simply seldom is.
Altec speakers are very fine. I have 515Bs and 802Ds.
The real TURKEYS in audio are amps...including the traditional low performance DHT amps people build and use on ALTEC speakers !! From your above post, you seem to be unaware of this deficit.
For example, off the top of my head, are your chokes over 20 Ohms DCR? Is your 45 and 2A3 amp three stages rather than two? In each case, you are losing necessary performance, especially on a horn system !!
I certainly hope you do not take my post in an offensive manner. I am just stating my opinion, from my perspective and direct experience.
Jeff Medwin
Oke thats fine Jeff
But you say that i have a problem?
the 300b is a very good sounding amp and i like it very much
i believe also that you build a very good sounding amp
i think so but i didn't hear it
same as you did not hear my amp
but you say that i have a problem if i have not the same amp as you
its a little strange to me
Its such a shame, with you being in Holland, that we two can't hear each other's Type 45 amps, but you can see the underside of mine.
Would your Type 45 SE amp's underside build look like mine??
Jeff
Jeff
When you say two stage amplifier, are you then using an active line stage/pre-amplifier?
You weren't joking about all those caps !!
Best to you,
Shane
Hi Shane,
No active line stage is wanted or needed with high efficiency speakers, just a simple but HIGHEST QUALITY attenuator. KISS rules.
Lotsa gain in the amp, a mu of 100 driver tube ( half a Telefunken 12AX7 smooth plate, DC coupled to a mu of 4 Type 45's grid ). See the Serious Stereo Web page for info on the technique and his quality attenuator.
Of course I am not joking about the 51 film caps in my stereo two stage DC amp !! They are the minimum I find necessary for highest quality of perceived performance.
No ONE film cap plays "all" the musical ranges ( at the speaker's voice coil ) perfectly, and caps PLAY notoriously narrow band, despite how they may statically measure on a test bench.
We have determined what cap values play best, at differing frequencies, and we can adjust the sound of the amplifier, so it conforms to an " all the music" playback at the speaker voice coil, which is my goal. Its NOT how the amp measures at idle, but rather, how it plays and captures the music dynamically to my ear. Does the amp REALLY perform ?
FEW designers understand this. But Mr. Dennis Fraker does, and he shared the technique with me Shane. What you see ( in that underside picture of mine ) has hardly ever been seen publicly on the WWW before, just one other time as I recall.
Jeff Medwin
Hi Jeff,
Thanks for the reply.
Shane
My German is a bit rusty, but the pictures say it all. Very nice!
Dave
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