Sorry for thread jacking..... ill start a new thread for the 6v6 se... Eli sent me a pm and itll be a nice project.
Norelco, Your builds are awesome great job. Man I wish you are near so I can hear your creations.... Beautiful beautiful
The korneff 45 is a very nice sounding amplifier if you have a preamp with enough gain. I used a jelabs 76 6sn7 pre and it was great. The glass audio 45 with sansui opts which the korneff was based on is nice as well and thats the one I still have with eml solid plate 45. I recently converted it to run type 46 tubes and its also nice.
Im now running altec 19, 9844a, and 9849 with fisher 50a monoblocks and music reference rm 200 and from time to time I pull out the 45 set and still enjoy them a lot. I just finished a kt 120 se ul amp and it also sounds nice... I really dont have a preference as I like both single ended and push pull amps....
Norelco, Your builds are awesome great job. Man I wish you are near so I can hear your creations.... Beautiful beautiful
The korneff 45 is a very nice sounding amplifier if you have a preamp with enough gain. I used a jelabs 76 6sn7 pre and it was great. The glass audio 45 with sansui opts which the korneff was based on is nice as well and thats the one I still have with eml solid plate 45. I recently converted it to run type 46 tubes and its also nice.
Im now running altec 19, 9844a, and 9849 with fisher 50a monoblocks and music reference rm 200 and from time to time I pull out the 45 set and still enjoy them a lot. I just finished a kt 120 se ul amp and it also sounds nice... I really dont have a preference as I like both single ended and push pull amps....
Tubo, thank you for responding. I'm glad to hear from someone who has built the Korneff. You mentioned earlier that you felt the Bugle was more dynamic -- Is that compared to the Korneff and Glory?
Anyone know of a TSE build using a different input tube? Nothing against the 5842 but I have no experience with it.
Thank you all for the input.
Anyone know of a TSE build using a different input tube? Nothing against the 5842 but I have no experience with it.
Thank you all for the input.
Norelco, have you started a thread for that Sun Audio VT25 project? I'd like to follow it if possible.
Hi JJ,
The bugle was more dynamic compared to both the korneff and the single ended glory. But if you use a preamp with the korneff or the se glory the playing field evens out. I would say that the se glory is very musical with the sansui opts and eml 45. The bugle is a very good sounding amplifier and you won’t be disappointed if you build any of the designs.
I kept the se glory because it was the first 45 i built. Id like to build the bugle again one day.
Thanks
Hi JJ, yes i started the project already but i have no time to start a thead for that subject [emoji4]
Here are some progress photos..
Target date of Completion, End of April.. my friend Edrel Sidon of AT&S Transformer will do the custom wound power transformer & choke for that project..
Here are some progress photos..
Target date of Completion, End of April.. my friend Edrel Sidon of AT&S Transformer will do the custom wound power transformer & choke for that project..
Attachments
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I'm also interested in a low power amplifier. I always liked these 45s, but I never built an amp with them.
My problem is if the ~2 watts will be enough to drive my FE168EZ BIBs. According to specs they're 94.5dBs. Are they sensitive enough for a 2-3W amp?
My problem is if the ~2 watts will be enough to drive my FE168EZ BIBs. According to specs they're 94.5dBs. Are they sensitive enough for a 2-3W amp?
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Per Paul Joppa's 102 dB. rule, you need more than 4 WPC. If you already own #45 tubes, give thought to push/pull, instead of SE.
Just wanted to say that I am also in NJ (southern NJ) I have quite a few interesting amps and would be interested in a listening session/comparison. Please keep me posted.
I don't own 45 tubes but I do own a pair of 2A3s.
Right now I'm listening with a breadboarded Thorsten's Legacy SE amp with a pair of 300B tubes and it's more than loud for my needs. I'm listening music at low to medium levels.
What about this calculator? How accurate is it?
Crown Audio - Professional Power Amplifiers
The math is accurate and I could not make it barf with absurd inputs (140dB @ 1,000 meters is indeed like 10 billion watts). OH!! It barfs for "small" inputs, it will not report less than 1 Watt. (They are not selling '45 amplifiers!)
But it does not ask the question right for domestic listening. Actually it gives the Direct Sound Field correctly but ignores the Reverberant Field.
In most living rooms, beyond 4 feet (a long Meter) the reverberant exceeds the direct.
Also "desired level" should be PEAK, not average. The sound level meter needle may be showing 90dB SPL, but if peaks to 106+dBSPL are not handled cleanly there will be "overload" on the loud parts.
For shoebox speakers this suggests 100+ Watts. For A-7 theater horns, 6 Watts.
Oh, wish I had the space for large horns! Even the BIBs with FE168EZ are large for me. And as see I must forget 45s or even 2A3s. 🙁
PRR, how many watts do you suggest with FE168EZ BIBs?
PRR, how many watts do you suggest with FE168EZ BIBs?
The comments in this thread have steered me towards the Bugle and TSE 45 amps. Before committing to a BOM and ordering parts, anyone want to convince me to get rid of the caps, use an interstage transformer and run all DHTs!?!? My arm is available for twisting...
Hello All,
Since this thread started I have built three SE 45 amplifiers. I did build Eric B Old Glory.
This design is as I read similar to the Jeff Korneff 45 amp which us two 6sn7 instead of the one 6sn7 used in Old Glory. Does the Korneff Amp run the 6sn7's in Parallel or SRPP?
I would like to optimize Old Glory.
OB
Since this thread started I have built three SE 45 amplifiers. I did build Eric B Old Glory.
This design is as I read similar to the Jeff Korneff 45 amp which us two 6sn7 instead of the one 6sn7 used in Old Glory. Does the Korneff Amp run the 6sn7's in Parallel or SRPP?
I would like to optimize Old Glory.
OB
If you live in an apartment, and it has thin walls between apartments,
then the question how much power do I need?, becomes a completely different equation:
How much power will get me kicked out of this apartment?
The rule of thumb for eviction.
Your Mileage May Vary.
then the question how much power do I need?, becomes a completely different equation:
How much power will get me kicked out of this apartment?
The rule of thumb for eviction.
Your Mileage May Vary.
Glowing DHT from AC gives different result than active DC, there you can have progress. Dedicated boards can be had which require a transformer per 45.
DC filaments on DHT does eliminate the IM Distortion of 2X the power mains frequency.
With AC filaments, each sine wave test tone has either 100Hz or 120Hz upper and lower sidebands on it.
Or during music playback, each music note has either 100Hz or 120Hz upper and lower sidebands on it.
And the harmonics of the music note has those sidebands too.
Examples for 60Hz power mains:
1. 1kHz tone has 880Hz lower sideband and 1120Hz upper sideband on that 1 kHz tone.
2. A flute player plays 'concert A' a 440Hz note, it has a 880Hz harmonic (part of the flute note is the harmonic structure of the instrument and how it is played).
You get 320Hz and 560Hz sidebands on the 440 note,
And you get 760Hz and 1000Hz sidebands on the 880Hz 2nd harmonic of the 440Hz note.
But there is a tradeoff with DC filaments on DHT.
(not only the fact that you need a DC supply)
The effective transconductance is not equal across the plate structure.
That is because one end of the filament is more positive than the other end of the filament.
The transconductance, and current to the plate is lower at the more positive end of the filament, and higher at the more negative end of the filament.
That is why I now prefer the 45 and 2A3 with 2.5VDC on the filament, instead of the 300B with 5VDC on the filament.
There is a "300B" that has a 2.5V filament. It is the JJ 2A3, it has 300B-like plate curves, a 40Watt plate, and a 2.5V 2.5A filament. Because it can do 40W in the plate, it has a glass envelope that is much larger than a real 2A3, so it may not fit in many 2A3 spots, not enough room.
For the most part, if you use a DHT, both AC and DC filaments work well.
Build an amplifier, adjust it, and happy listening.
With AC filaments, each sine wave test tone has either 100Hz or 120Hz upper and lower sidebands on it.
Or during music playback, each music note has either 100Hz or 120Hz upper and lower sidebands on it.
And the harmonics of the music note has those sidebands too.
Examples for 60Hz power mains:
1. 1kHz tone has 880Hz lower sideband and 1120Hz upper sideband on that 1 kHz tone.
2. A flute player plays 'concert A' a 440Hz note, it has a 880Hz harmonic (part of the flute note is the harmonic structure of the instrument and how it is played).
You get 320Hz and 560Hz sidebands on the 440 note,
And you get 760Hz and 1000Hz sidebands on the 880Hz 2nd harmonic of the 440Hz note.
But there is a tradeoff with DC filaments on DHT.
(not only the fact that you need a DC supply)
The effective transconductance is not equal across the plate structure.
That is because one end of the filament is more positive than the other end of the filament.
The transconductance, and current to the plate is lower at the more positive end of the filament, and higher at the more negative end of the filament.
That is why I now prefer the 45 and 2A3 with 2.5VDC on the filament, instead of the 300B with 5VDC on the filament.
There is a "300B" that has a 2.5V filament. It is the JJ 2A3, it has 300B-like plate curves, a 40Watt plate, and a 2.5V 2.5A filament. Because it can do 40W in the plate, it has a glass envelope that is much larger than a real 2A3, so it may not fit in many 2A3 spots, not enough room.
For the most part, if you use a DHT, both AC and DC filaments work well.
Build an amplifier, adjust it, and happy listening.
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OK, Thanks ! --- So what Tube Compliment are you using? I assume the 45 tube, a 6SN7 for each channel and what are you using for the Rectifier?