Search found 11 matches

by radio_elasais
Sun Mar 01, 2009 4:48 pm
Forum: Transformers
Topic: Gianlucas 75TL
Replies: 14
Views: 13012

That's what I was wondering too. Running MAC OSX 10.4.11 and safari 3.2.1

Ciao
Gianluca
by radio_elasais
Sun Mar 01, 2009 3:53 pm
Forum: Transformers
Topic: Gianlucas 75TL
Replies: 14
Views: 13012

Can't a guy get some sleep here... I go to bed and wake up to this...:-) Two quick things first. Gianluca, Parallels works great for me to run LTspice on my mac. For soundcard work it tends to stumble so i go boot camp. Also I sized your last two pics down by 50% (from 150 to 75ppi) to avoid the dr...
by radio_elasais
Sun Mar 01, 2009 2:04 pm
Forum: Transformers
Topic: Gianlucas 75TL
Replies: 14
Views: 13012

To make it clear, here is a draft of the amp I am thinking at. There is no driver but a step-up transfomer and just a 75TLs. Fixed bias and DC for hte 75TL filaments. I am biamping and the puppy will serve from 400Hz up on 110dB horns. Talking 100mW of power. The offset winding is not necessary to m...
by radio_elasais
Sun Mar 01, 2009 1:05 pm
Forum: Transformers
Topic: Gianlucas 75TL
Replies: 14
Views: 13012

Ciao Lars. reading your post and reading again Dave's I understand that I must post the revised schematic. I made that R2 higher, now it is 4.7K and I found it can smooth a bit the load the filter is reflecting onto the tube via the transformer. I made a reference to a very old discussion here and d...
by radio_elasais
Sun Mar 01, 2009 10:21 am
Forum: Transformers
Topic: Gianlucas 75TL
Replies: 14
Views: 13012

hey, sorry for the delays. below is the 211 crossover, My first question is why the 600R resistor (R2) at the output of the IT? dave That's a potentiometer ... daven stepped attenuator, now I am using a 500R plastic film. You know what? I tried them after the Sakuma's amps, well actually I prefer l...
by radio_elasais
Sun Feb 22, 2009 12:01 pm
Forum: Transformers
Topic: Gianlucas 75TL
Replies: 14
Views: 13012

Filter was here but I cannot find anymore the spice file: http://www.intactaudio.com/forum/viewtopic.php?t=594 I tuned the filter after that post and here it is the latest results with components value http://www.audiofaidate.it/forum/uploaded/gluca/xvover_86.jpg Now those components give me the bes...
by radio_elasais
Sun Feb 22, 2009 12:27 am
Forum: Transformers
Topic: Gianlucas 75TL
Replies: 14
Views: 13012

Output: I don't need power. 0.5W would bring me 100dB at 5 meters. The amp is directly connected onto 110dB horns with no attenuation at all (JBL 2350 + JBL 2482). Oh! Signal-to-noise ratio is a pain! I believe I am using 100mW during peaks. OK, I'll follow the Colorado guys with 30K:16. Input: the ...
by radio_elasais
Sat Feb 21, 2009 7:44 pm
Forum: Transformers
Topic: Gianlucas 75TL
Replies: 14
Views: 13012

Bump UP! Dave, I have my 75TLs running but the OPT is not optimized or those puppies. The plan is to modify the amp and use the 845 (easy and quick) and to build a new one for the 75TL. PSU is ready, filaments are OK. But I need some custom irons. The basic idea is to use a 1:8 input tranny (it will...
by radio_elasais
Sat Jan 19, 2008 12:05 am
Forum: Inductors
Topic: LC 600ohm xover
Replies: 4
Views: 12576

Ciao, it seems that the old asc file has been erased. Btw I made some calculations by hands (no spice at home) and 150mH/0.79uF (2*0.47) 330mH/1.41uF (3*0.47uF) would give me a 330Hz hi pass and low pass filter. Impedance slightly higher than 600Ohm. It sounds good to me. The inductors should be tap...
by radio_elasais
Tue Jan 15, 2008 3:25 am
Forum: Inductors
Topic: LC 600ohm xover
Replies: 4
Views: 12576

Ciao Dave Thanks for the reply. I am glad to hear others agree on the low Z. Cinemags are wound on small ferrite torroids and sound good. Pultec had ferrite inductors at the end of the day and their sound is out of question! I was thinking to a gapped nickel core actually. I'll try to recover the ol...
by radio_elasais
Sun Jan 13, 2008 12:05 pm
Forum: Inductors
Topic: LC 600ohm xover
Replies: 4
Views: 12576

LC 600ohm xover

Ciao! First post here but I have been looking at Dave's forum since ages. I prototypied a 600Ohm LCL xover I am driving with my 801A preamp and I currently use it for my biamped system. Having a line xover allows me to run my horns and onkens free and it is a huge improvement over the "traditio...