tubelion

You are using good SET, why worry? Mine is Jadis 300B 10W, very good result, I actually use the 3619 transformer and experiment 4-0 and 4-x taps with success, no problem, just a taste preference for listening to different music, just attach the extra wire soldering at the tap x and connect it to ground when 4-x is preferred, done in a minute. I am experimenting the single driver full range open baffle design now and have fun but busy to mod. the Belle further. But can recommend type A without reservation. Tubelion

Hi Khorn58, There is a 54 Khorn asking for an offer in the 2-channels audio forum. Though ugly paint indeed Tubelion

Hi John, Thanks , you are always helpful. I will search the information about the JBL. I ask beacause the alnico k55v and k77 to me are better than m version, so I am looking for alnico woofer. Tubelion

Ship internationally! How much to Hong Kong? and How! I really like to have this pair.

Has anyone tried this before? Any hints what to do in the process? As 288 has been tried by Qman with good result, is it worth to try? Thanks Tubelion

Hi John, where to get University C15W ? how much for a pair? Any idea about Magnavox 15' alnico drivers? Thanks Tubelion

I bought a pair of K77 at ebay, it is better than the original K77m sonically in my Belle and SET tube gear. Again, K55V sounds better than the m-version , I bought it a bit earlier, it is the partner of K77, with the help of K77, the performance is synergistically better. I am looking for bass woofer of alnico, but hard to find, never see one in ebay, anyone know the source to buy one pair. Would like to like the performance of the latest x-version which is alnico. Tubelion

Hi John, I have switched back to 4-0 taps in the output, 5-0 in the input for 2 days. Is it your setting? To connect to 4-x seems easy , just to connect one more wire from tap x to ground. I will try later. Tubelion

Hi John, Thanks for your information and schematic. I am using my type A, now switch back to 4-0. That should be OK. I did ask AL, switch to 4-x should not make a big change of frequency in type A. So I may try later. The new crossover you shared is a bit complicated that leaves from the simplicity that I prefer right now, but I appreciate much you share it to me. Thanks again Tubelion

Hi John, I think AL's advice about polarity is for his crossover, I will keep exactly to the type A schematic you showed above. I am experimenting with 4-0 at the output right now , knowing it is the PWK's original design, sound is different to 4-x, I will wait for a while to see which setting is better, but I find it easy to shift, just disconnect the x to ground, then it is 4-0, using the 0 as common ground, reconnect the wire x to ground then it is 4-x, change is done within half a minute. change to other setting needs soldering such as 5-2, so I will leave that for the moment. Hope I have connected it right. Tubelion

Hi John, Thanks for your information as I suspect the number may or may not mean the same thing in different transformer. So 4-0 is the default in T2a, Do I need to check it is the same as the 4-0 in 3619? So I will convert 4-x back to 4-0 in my 3619 to go back where PWK designed. I am also bit confused as AL stated in his website that the + - polarity is changed in his design, so for input tap 5 is + , tap 0 is - side and ground. for output, tap x is +, 4 is -. In my type A, it seems tap 4 is +, x is - side, am I correct? Thanks again Tubelion.

I learn from AL and John Warren that original type AA used 4-0 in the output, 5-0 in the input. The original type AB2 and AL3 used 3-0 in the output in my Belle and La Scala. I never saw a old original type A in this forum, would like to ask the default setting by PWK in type A. AL also suggested some other taps setting like 5-2 and 4-x, in the ALK crossover. I would like to ask the users of type A, what settings you are using. Thanks for any comment Tubelion

Hi Qman or john, May I see a photo show the other side of transformer so that I can copy the setting. I need to see clearly as I cannot solder it myself , I have to ask the technician to do it for me, better with a photo. It is really a good work, anything special about the wire? Thanks SZE

Dflip Thanks for your information Tubelion

Dear AL, It is a bit clearer now. But in the past, you posted the db attenuation in different settings that is not 1.5 or 3 db apart, closer like 0.6 db. Thanks