 Show Posts
|
|
Pages: 1 2 [3] 4 5 ... 11
|
|
31
|
Ceriatone / Overtone / Re: Overtone Soundclips
|
on: September 02, 2011, 08:29:35 AM
|
Great clip Erwin.
super playing and nice sounding amp. Is that the same specs as my amp?
Steven
Hi Steven, Thnx. No, it is close to a normal OTS with skyliner EQ. Your amp has a Bluesmaster EQ. |
|
|
|
|
32
|
Ceriatone / Overtone / Re: Questions about new FM100
|
on: September 01, 2011, 07:25:37 PM
|
Without going into technical blabla; lenght determines high content and the RG400 is a very high quality cable. The connection from the amp to the clator isn't supposed to be that long, the output of the amp and the output of the clator have a high impedance which even in a amp with suitable wire it is normally about 10cm max. Using long cable or low quality cable is very significant in the high freq. Anyway; hearing is believing. I'm not going back to regular cables.
Aw, now you've made me very curious ;-) Anyway, when you have some time, I'd love to hear about it. Just found a post from a guy with a Quinn 183 who also uses them. Length determines the effect?
|
|
|
|
|
33
|
Ceriatone / Overtone / Re: Questions about new FM100
|
on: September 01, 2011, 07:16:45 PM
|
I'm not aware of any pre made (with jack plugs) Rg400 cable. Optimum lengt is around 2 meters. You're welcome pethenis. When the presence is more open you can use more bass and mid, especially on the FM series. The presence is working in the high and mid high frequencies. For normal OTS series the presence is focused around high frequencies only. Indeed the more the the tone controls are open in "non-pab setting", the less the gap between non-PAB and PAB. Some other "trick": using RG400 cable for interfacing between amp and clator(don't have time to explain on that fenomenon). Thanks Erwin! I'll give that a try tonight. What is the relation between presence, tonecontrols and PAB? I thought PAB took the tonecontrols out of the signalpath? Is what you're saying, the more the controls are open in "non-pab setting", the less(?) the gap between non-PAB and PAB?
Erwin, Do you have a source for pre-made cables that you can share, or do we need to build our own? What's the optimum lengths? Thanks!!! |
|
|
|
|
34
|
Ceriatone / Overtone / Re: Questions about new FM100
|
on: September 01, 2011, 12:20:12 PM
|
You're welcome pethenis. When the presence is more open you can use more bass and mid, especially on the FM series. The presence is working in the high and mid high frequencies. For normal OTS series the presence is focused around high frequencies only. Indeed the more the the tone controls are open in "non-pab setting", the less the gap between non-PAB and PAB. Some other "trick": using RG400 cable for interfacing between amp and clator(don't have time to explain on that fenomenon). Thanks Erwin! I'll give that a try tonight. What is the relation between presence, tonecontrols and PAB? I thought PAB took the tonecontrols out of the signalpath? Is what you're saying, the more the controls are open in "non-pab setting", the less(?) the gap between non-PAB and PAB?
|
|
|
|
|
35
|
Ceriatone / Overtone / Re: Questions about new FM100
|
on: September 01, 2011, 09:37:01 AM
|
|
Another dutchy! Best way is to turn off the bright switch on the clator and also turn it off on the amp.
On the amp; master half way up, on the clator; Drive; around 12 '0 clock, In: full clockwise, Out: this is your new master volume.
This will give you a round smooth OD tone on your amp.
If you raise the Presence you can get your tone controls up too; when the tone controls are more clockwise it will give less PAB volume jump. If still not satisfied there are some workarounds by changing some components.
|
|
|
|
|
36
|
Ceriatone / Overtone / Re: Overtone Soundclips
|
on: August 06, 2011, 07:38:29 PM
|
|
Bold: Thnx! ...that Bluesmaster Non hrm is doing well in the right hands, glad you took it a step further with the#183 variations/ EL34.
SoundPerf:Thnx for listening. The soundclip is a standard OTS with some modifications, I did this for a customer.
|
|
|
|
|
37
|
Ceriatone / Overtone / Re: Overtone Soundclips
|
on: August 05, 2011, 02:13:36 PM
|
Hi Ika, Thnx for listening! Indeed that's funny coming from your mouth  The amp was recorded at very low living room volume. My kids and wife were in the same room without complains. Louder does make it more creamy. Your rotary switch is a good thing (or as I have done before: a cap and a pot for filtering;) but not desirable for a quick and cheap mod as was the intention. |
|
|
|
|
39
|
Ceriatone / Overtone / Re: Moody
|
on: June 22, 2011, 11:26:40 AM
|
Only variac won’t work because it will change voltage up or down depending on wall voltage change.
I got the impression from Boldaslove's comment it does work? It only works if you measure the voltage of the variac and set it for the right voltage; During a show you can ask your roadie to monitor this voltage and correct it if necessary. |
|
|
|
|
40
|
Ceriatone / Overtone / Re: Moody
|
on: June 22, 2011, 08:05:54 AM
|
|
Psycho acoustics are involved but also wall voltages!
Since the powertransformer is basically a step up transformer(voltage wise) lower or higher wall voltages can make the voltage onthe v1 preamp tube go 20 volts higher or lower.
This is very noticable. Lower voltages wil give a more dark and compressed sound. High voltages will give a stiff and brighter sound.
Fe. here in the EU wall voltages can go in one day from 220v to 240 v. The B+ can be 420v@220v wall voltage.
The B+ can be 460v@240 wall voltage.
No mumbo jumbo but measurable and very noticable soundwise!
|
|
|
|
|
41
|
Ceriatone / Overtone / Re: BM JM Mod
|
on: June 11, 2011, 10:35:01 AM
|
I have an old 80s EV12L.
Have tried it a number of times in a ported cabinet...similar to pickmasters snakeskin ditto. However, I find it to be pretty useless for OD .....AT LOWER VOLUMES! :-)
It better at gig volume.
I have tried a eminence kappa Pro in the cabinet and it has a better OD top end but its perhaps a little dark. The best speaker for The ported cabinet is IMO is a Fane 12L ...it has both great clean tone and great OD tones at ANY volume. And the Fane has a massive bottomend similar to a 4x12. Incredible IMHO.
Is the Fane having the same mounting dimensions as a regular 12"? |
|
|
|
|
42
|
Ceriatone / Overtone / Re: Buffered fx loop - Which one to get?
|
on: June 11, 2011, 06:41:01 AM
|
|
If you have a very good sounding amp and you don't want to get the dlator shape or"suck"tone away you can mod the clator.
Remove the NFB from the Clator and decrease the grid stopper resistor.
Personally I don't like that but I can imagine there are lots of people who do.
|
|
|
|
|
43
|
Ceriatone / Overtone / Re: Dropping String....a little help, please.
|
on: May 31, 2011, 03:06:53 PM
|
Hi Cris, Are you comfortable making a loadline for a 12ax7 tube? The plate resistor/cathode resistor is 66:1. When you have ideal voltages there is a point where the amplification is non-linear when the grid signal increases. When plate voltages are too high you move too far away from that point. When voltages are too low you don't have much headroom. That's why I would go for changing your dropping string and not the anode resistor because anode resistor swapping is gonna change the characteristics of the the amplification. Unfortunatly is a bit hard to calculate the dropping string because of the diffrences between tubes drawing current. Wall voltage is right at 100V....right where it should be for Japan. I either use PT's with 100v taps on most of my builds or use step up transformers for my vintage amps. Anyway, I have the D'lite on the bench right now and the voltages are all pretty good. It's a surprisingly good sounding amp for the "little D bastard" that it is.
On the OTS.. B+ is 440v. I did some more tube swapping and as before V1 is perfect at 190v, V2 still low at 184v and PI at 307v. Optimally I would like to have them at 200 for V2 and 290v for V3. I may go back to the lower plates on V2. I'm going to order a range of dropping resistors to see what I can do. I would still like to better understand the science behind the calculation to come up with the best value of dropping resistor....(for this amp).
|
|
|
|
|
44
|
Ceriatone / Overtone / Re: Dropping String....a little help, please.
|
on: May 31, 2011, 11:26:49 AM
|
Hi Cris, If that doesn't help: to lower v1 voltages you can make the last dropping string resistor a 3k3 or a 2k7(the one at at the side of the chassis near tube v1). To lower the voltages for the PI: the 2k2 (you already swapped for a 3k3) can be lowered to a 3k9, but this will also lower the voltages at v1 and v2. Make sure you check your wall voltage and B1 voltage; especcially if you're living in a 110/120v wall voltage area. 5v more or less (in a 110/120v wall voltage situation)does make a big difference in the B+ voltages. Erwin Thanks Erwin. Yes, I have been swapping tubes and will continue to do more tonight. Right now I have Mullards in V3 and V1 with an old Baldwin in V2. I have plenty of new and old pre's to mix and match however this combination gave the best results to get the voltages closest to optimum. I actually have 270pf on half of V2 and 330pf on the other at the moment but will drop that down, too.
|
|
|
|
|
45
|
Ceriatone / Overtone / Re: Dropping String....a little help, please.
|
on: May 31, 2011, 08:03:41 AM
|
Measuring voltages is highly dependend on what kind of pre-amp tubes you use. Fe. JJ 12ax7 tend to draw more current than Tad 12ax7. So voltages will be different, sometimes up to 15 volts(!). You can swap tube v1 and v2 and see what happens. Btw if you use a Clator try lowering your snubbers to 270pF. After years of enjoying the clean channel on my original 50W OTS.....(one of the first few OTS amps) ... I'm finally addressing the OD channel to smooth and tighten it up a bit. I've upped the first two PS filter caps to 200uf, slope to 100k, V2 plates to 220k and 150k, 330pF snubbers, 68pF master cap. C'Lator is in the loop.....It's getting there....
Right now V1 plate voltages are at 195/208v...(good) V2 is 184/200v (low) and PI is a little high at 299/302. As simple as Ohms Law is I'm a little unsure how to adjust the values of the 2k2 and 22k dropping resistors for V2 and V3 to bump them to optimal Dumble values with the higher V2 plates. B+ at PS2....PI trimmer is 423v. Voltages didn't change much with a 3k3 in place of the 2k2. Any help would be much appreciated. My D'Lite is up for similar fine tuning so I want to get a better handle on this subject.
Thanks
|
|
|
|
|
|
to keep the forums alive.