Search found 193 matches
- Mon Aug 22, 2011 8:24 pm
- Forum: Trainwreck Discussion
- Topic: TW Express clone with a Post PI Master Vol...
- Replies: 44
- Views: 13148
Re: TW Express clone with a Post PI Master Vol...
I've got a LarMar Type-II in my Express clone, and while I agree that no MV sounds 'great', I AM happy with this one in THIS build. (There are some amps that it absolutely DOESN'T 'work' in - like a black-face Fender style circuit...) I use it to 'take the edge off' - meaning dial the volume back ju...
- Wed Aug 17, 2011 3:03 pm
- Forum: Trainwreck Discussion
- Topic: Impedance Switch
- Replies: 8
- Views: 2085
Re: Impedance Switch
http://www.mouser.com/ProductDetail/NKK-Switches/HS13Y-RO/?qs=sGAEpiMZZMvNbjZ2WlReYkpV6FM9qs2Sq99ujwMfZJo%3d Good choice. I buy that switch in quantity and use it in every single build I do that requires a selector switch. I even used one to replace the scary impedance selector on my old metal-pane...
- Tue Aug 02, 2011 7:33 pm
- Forum: Trainwreck Discussion
- Topic: Liverpool Output Transformer Selection
- Replies: 34
- Views: 11318
Re: Liverpool Output Transformer Selection
Thanks for clearing that up - I was mistaken.
- Tue Aug 02, 2011 2:53 pm
- Forum: Trainwreck Discussion
- Topic: Liverpool Output Transformer Selection
- Replies: 34
- Views: 11318
Re: Liverpool Output Transformer Selection
Correct Same type I believe it is beefy enough Rated at 3A @ 250 VAC and 5A @ 125VAC I'd like to get others' input on the ratings Markus You didn't mention it, but I'm guessing that you're using the switch on the OT secondaries, right? That switch rating is MORE than sufficient for use on the secon...
- Sat Jul 16, 2011 12:50 am
- Forum: Trainwreck Discussion
- Topic: First Rocket...some questions
- Replies: 10
- Views: 2735
Re: First Rocket...some questions
Two 70uF in series makes 35uF. Two 80uF in series is 40uF. The spec sheets for GZ34 say 60uF is maximum (to limit peak current), but exceeding that by some amount (two 40uF are shown in parallel for 80uF in the Rocket schematic) probably only means a little reduction in life. TaDa! A little theory ...
- Fri Jul 15, 2011 12:56 am
- Forum: Trainwreck Discussion
- Topic: First Rocket...some questions
- Replies: 10
- Views: 2735
Re: First Rocket...some questions
With a GZ34 you need to limit the total filtering so I wouldn't go with the larger caps on main filtering. I believe Normster used 40-47uf there. This has always had me scratching my head when I read this here - Go look at the AA165 and AA1069 schemos for Fender Pro Reverbs - GZ34 and 5U4 rectos, r...
- Mon Jul 11, 2011 8:12 pm
- Forum: Technical Discussion
- Topic: 68 SF Bassman volume loss
- Replies: 23
- Views: 6295
Re: 68 SF Bassman volume loss
Cool, Mike - I wasn't trying to force your hand in any way; it's more trying to have your trouble-shooting be based on some hard facts about what your amp is doing. I get it about your newness to this - being 'new' doesn't mean 'don't proceed'. There are some good tips here already - get a clip-on g...
- Mon Jul 11, 2011 3:05 pm
- Forum: Technical Discussion
- Topic: 68 SF Bassman volume loss
- Replies: 23
- Views: 6295
Re: 68 SF Bassman volume loss
At the risk of sounding repetitive, have you taken a full set of voltage readings yet? Voltage readings are a REALLY basic, informative diagnostic tool, and can be more revealing than your eyes can. 8) Without voltage readings, you're on an Easter egg hunt. Take a set of readings when you first fire...
- Fri Jul 08, 2011 8:00 pm
- Forum: Technical Discussion
- Topic: What materials and thicknesses will work for eyelet board
- Replies: 28
- Views: 7000
Re: What materials and thicknesses will work for eyelet board
Myself, and a WHOLELOTTA other people, use Garolite board material, available from McMaster in many thicknesses and colors. Works great and fairly cheap. It's murder on cutting tools and drill bits though. LOL! I got an inexpensive water table tile cutter from Harbor Freight, and have used that to c...
- Thu Jul 07, 2011 7:51 pm
- Forum: Technical Discussion
- Topic: 68 SF Bassman volume loss
- Replies: 23
- Views: 6295
Re: 68 SF Bassman volume loss
You probably know this already, but just in case... don't assume that a 'visually fine' capacitor (or anything else) implies a 'functionally fine' capacitor. I suspect the caps right away, based on what you're describing. A good place to start with diagnostics is a full set of voltage readings. Got ...
- Wed Jul 06, 2011 7:17 pm
- Forum: Technical Discussion
- Topic: No output
- Replies: 39
- Views: 7317
Re: No output
From what I've read now in further posts (haven't looked at your pictures), it sounds like you've taken other actions that accomplish the same thing as swapping the polarity of the OT secondary. So you've got the right stuff done, you've just taken the complicated way to get there. :wink: When I've ...
- Wed Jul 06, 2011 2:54 pm
- Forum: Technical Discussion
- Topic: No output
- Replies: 39
- Views: 7317
Re: No output
Good Heavens.... I would not, in a Million years, have ever thought that swapping the secondary would matter. I have it wired per the color of the AB165 layout. I will try swapping the leads and see if that helps. My comments are based on assuming that you've configured your ENTIRE output stage, fr...
- Tue Jul 05, 2011 8:13 pm
- Forum: Technical Discussion
- Topic: No output
- Replies: 39
- Views: 7317
Re: No output
Since we haven't seen pictures of what you did, I'll just share some comments about YOUR comments about using the AA864 NFB. To follow up on xtian's post: As someone who has done the hybrid AA864/AB165 conversion on two AB165 circuits, and converted a Pro Reverb to a "Bassman Combo" using the same h...
- Mon Jul 04, 2011 10:41 pm
- Forum: Technical Discussion
- Topic: Tube rectifier differences
- Replies: 2
- Views: 1400
Re: Tube rectifier differences
Holy CRAP! No wonder amps with these thing sag...tubeswell wrote:5Y3 = 125mA
- Mon Jul 04, 2011 6:41 pm
- Forum: Technical Discussion
- Topic: Tube rectifier differences
- Replies: 2
- Views: 1400
Tube rectifier differences
This is a follow-up to my previous post asking advice about using a 5Y3 rectifier tube in my 5E3 build, versus a 5AR4. I got good suggestions about that, for which I thank everyone. I appreciate the advice about getting a vintage 5Y3, and probably will eventually, but just to satisfy my own curiosit...