Search found 229 matches
- Sat Jun 20, 2020 4:13 pm
- Forum: Everyones Projects
- Topic: The Other 13E1 SE-OTL
- Replies: 227
- Views: 91059
Re: The Other 13E1 SE-OTL
Great results Ray. It always feels good if listening results are comparable. I had the same impression with the 6C33 OTL and it says something about multi tube and single output tube OTLs IMO. J. Broskie has mentioned somewhere that 6 and more output tubes connected in parallel would actually sound ...
- Tue Jun 09, 2020 4:16 pm
- Forum: Speakers
- Topic: Speaker Protection
- Replies: 17
- Views: 10787
Re: Speaker Protection
If B+ was connected to the speaker, the current would depend entirely on the output impedance of the power supply. This happened not with a HV psu but with the SLB (active bridge rectifier, cap multiplier)at 38V which can deliver 5A max /2x15kuF for the dual rail version. The SLB has a very low out...
- Tue Jun 09, 2020 1:42 am
- Forum: Speakers
- Topic: Speaker Protection
- Replies: 17
- Views: 10787
Re: Speaker Protection
Ok, then let's rephrase: how much current would flow through a 8ohm speaker if there is a short circuit in a tube or some other unforeseen problem connecting B+ with the output? I lost a $1200 Lowther DX4 (but they have very good replacement deals) because of a simple short in a tube socket (tiny ha...
- Mon Jun 08, 2020 9:03 pm
- Forum: Speakers
- Topic: Speaker Protection
- Replies: 17
- Views: 10787
Re: Speaker Protection
Question: will an OTL pass enough DC current to worry a speaker? I'm wondering if there's any need for protection here. B+ in case of a faulty tube or a simple discharge if the tube is gassy. This only applies to PP or OTLs without an otuput cap like the InvOTL. The Pinnacles use a TVS diode agains...
- Mon Jun 08, 2020 6:05 pm
- Forum: Speakers
- Topic: Speaker Protection
- Replies: 17
- Views: 10787
Re: Speaker Protection
Yes, I've looked at them before but they're not up to the potential DC voltages in a valve amp, not even the modest 150V in the Mellow OTL. There is a simple way of how to use them for any psu voltage and without the built-in SSRs. I like them because they put the detection circuit between two opto...
- Tue May 26, 2020 11:34 pm
- Forum: Everyones Projects
- Topic: Any Interest - Soft Start PCBs
- Replies: 4
- Views: 2888
Re: Any Interest - Soft Start PCBs
He has made that very complex just to avoid using a £2 AVR (IMHO). Not sure why bother using a thermistor instead of some resistors as they will be out of circuit after half a second. But at least that’s the way I do it. It's really too complex! Not necessary IMO. Using a thermistor instead of resi...
- Mon May 18, 2020 5:29 pm
- Forum: Everyones Projects
- Topic: The Other 13E1 SE-OTL
- Replies: 227
- Views: 91059
Re: The Other 13E1 SE-OTL
Very mysterious answer...Patience is a virtue Wolfgang...
...and I am working on something in order to overcome the dynamic limitations of 1-2W SE OTLs with the help of Maid reg.
- Mon May 18, 2020 4:59 pm
- Forum: Everyones Projects
- Topic: The Other 13E1 SE-OTL
- Replies: 227
- Views: 91059
Re: The Other 13E1 SE-OTL
Very nice, Ray. Your patience pays off.
But it looks like you won't use Maida reg. for the 13E1 tubes. Why?
But it looks like you won't use Maida reg. for the 13E1 tubes. Why?
- Wed May 13, 2020 12:53 am
- Forum: Everyones Projects
- Topic: Inverted OTL with 6SN7/6AS7
- Replies: 125
- Views: 60812
Re: Inverted OTL with 6SN7/6AS7
Metalwork is one of my pet hates, what did you get and how are you finding it? I got the E4. Now it has been replaced by the “Evolution 4”. Basically the same but with the one piece spoilboard and a stronger router mount, important for precision which was actually the only weak point IMO with the E...
- Tue May 12, 2020 4:13 pm
- Forum: Everyones Projects
- Topic: Inverted OTL with 6SN7/6AS7
- Replies: 125
- Views: 60812
Re: Inverted OTL with 6SN7/6AS7
I finished my InvOTL some time ago and thought the result is worth a picture. InvOTL.jpg DC offset can be easily readjusted with the two pots in the back. The mV meters can be turned ON/OFF for checking and getting it down to 0mV. I mounted all the tubes on a separate aluminum board (would have been...
- Sat Mar 28, 2020 1:31 pm
- Forum: Speakers
- Topic: Sound damping material
- Replies: 32
- Views: 20789
Re: Sound damping material
If that's the frequency response of the driver in a baffle then it will work even at lower frequecnies. Must be a hell of driver!
- Thu Mar 26, 2020 6:08 pm
- Forum: Speakers
- Topic: Sound damping material
- Replies: 32
- Views: 20789
Re: Sound damping material
I wonder how they would perform with a full range unit, like the Lii Audio ones, run open on a small baffle? They subs are limited to 120Hz max with the internal x-over because of servo control precision. The higher the frequency the harder for the servo to react precisely enough. Using the LFE inp...
- Wed Mar 18, 2020 1:55 am
- Forum: Speakers
- Topic: Sound damping material
- Replies: 32
- Views: 20789
Re: Sound damping material
Obviously a misunderstanding.
The drivers are the SW-12-08
http://www.rythmikaudio.com/GR_drivers.html
can be ordered here: http://gr-research.com/drivers.aspx
Couldn't find the link for the H-frame plans so I attached the pdf.
The drivers are the SW-12-08
http://www.rythmikaudio.com/GR_drivers.html
can be ordered here: http://gr-research.com/drivers.aspx
Couldn't find the link for the H-frame plans so I attached the pdf.
- Tue Mar 17, 2020 3:50 pm
- Forum: Speakers
- Topic: Sound damping material
- Replies: 32
- Views: 20789
Re: Sound damping material
And the OB subs? The subs come with a 370W RMS into 4 ohm amp (linear psu) per channel with the servo control board built in. A370XLR3 (2).jpg All controls are analog which is not my favorite way of doing this kind of stuff so I bypass them (LFE input ) and use my digital x-over for controlling Kli...
- Mon Mar 16, 2020 11:16 pm
- Forum: Speakers
- Topic: Sound damping material
- Replies: 32
- Views: 20789
Re: Sound damping material
Simon, I listen with active (TS 300B PP/Burmester clone) modified Klipsch La Scala horns. The photo shows what I did. KH_sub.jpg The original sound has changed a lot, more open and relaxed than the typical KH sound. The midrange horn/300B PP needed some EQ for sounding lush and full rather than anem...