obbm

Late 1989.

Eternal optimist? [url="http://cgi.ebay.co.uk/musicman-stingray-5-string-bass_W0QQitemZ110486883724"]http://cgi.ebay.co.uk/musicman-stingray-5-string-bass[/url]

[quote name='richrips' post='727551' date='Jan 28 2010, 01:30 PM']i don't know if anyone would know, but is there, or is there likely to be a difference in the preamp section for the 1000 and 350? I saw the link above recently on here and wondered if it applied to both models, as maplin sell all the necessary.....[/quote] pPre-amp is exactly the same in both models. I have the schematic if anyone needs it

This whole problem raises another issue. Presumably this product must have a "CE Mark" to be legally sold in Europe. Maybe PJB just put the stickers on and hope that no-one ever checks/asks if it has been correctly tested and certified. If it's generating that amount of audible noise, just how much RF interference is it putting out. I used to have terrible troubles with my Epifani UL502 wiping out radio reception whenever it was on. Is it a case of US manufacturers thumbing their noses to the law?

When I needed a black one for my SR5 I asked EBMM and they sent me a whole packet. If black is what you need then PM me your name and address and I'll pop one in the post.

Why not use the power amp section of a Markbass F1? 1U, almost 1/2 rack width and quite shallow.

[quote name='d-basser' post='722785' date='Jan 24 2010, 01:35 AM']Next query: Do the valves have to match? Is it a case of two 12AX7 or two 12AT7 or could you use one of each? And if so what would happen?[/quote] No need for them to be matched so they can be different. It's best to try different types to see what works best however it is the first one, the one nearest the input socket, that makes the most difference as it provides the initial gain and drive. Now I have the covers off mine I'll have a look at the circuit design.

A couple of comments. The Orange bass Terror can be tamed by changing the valves to make it less aggressive, however it still has that Orange tone. The Ashdown LG1000 is not 1000-watts into 4-ohms. It has 2 x 500-watt in 4-ohm power amps which are not bridgeable, so it 500-watts into 4-ohms + 500-watts into 4-ohms. No problem with using just one power amp and leaving the other unconnected. One BCer took the approach of an EBS Microbass 2 and a very small lightweight power amp made for him by BC member "Alien". I saw it at one of the SE Bashes and it seemed very com pact although not quite as small as a Shuttle 6.

Just tried a 5751, 12AY7 and a 12AU7. They all have lower gain than the unbranded stock 12AX7 so make a considerable difference. Only able to use headphones so next test will be with speakers. I think I shall probably use a 5751 in the V1 position and when tested with speakers may change V2 to a better quality valve. If gain is not a problem then it might be worth trying a 12AY7 or even a 12AU7. I have a very nice CBS 12AU7, bought from Ebay. They were made for use in CBS studio equipment. There are some useful vave gain comparison charts on the Net. [url="http://thetubestore.com/gainfactor.html"]http://thetubestore.com/gainfactor.html[/url] [url="http://www.300guitars.com/articles/preamp-tube-gain-factors-and-substitution-chart/"]http://www.300guitars.com/articles/preamp-...titution-chart/[/url] [url="http://www.diyguitarist.com/GuitarAmps/SD-Convertible/patgf1.htm"]http://www.diyguitarist.com/GuitarAmps/SD-...ible/patgf1.htm[/url]

Very sad that the brave act of trying to save a friend had such tragic consequences. Condolences to friends and family.

[quote name='Dr.Dave' post='721146' date='Jan 22 2010, 01:26 PM']Dave - I know it's been a few months but , happily , you're still recovering from surgery I believe - are you sure you want to risk this possible setback?? [/quote] It's a long slow process but I am making progress. As long as I'm relaxed and sitting down then I should be OK.

[quote name='Dr.Dave' post='721095' date='Jan 22 2010, 12:47 PM']I can't imagine you'd like me to post it would you?????????[/quote] It can't be any worse than my 1970 passport photo, or maybe it is? Go on, do it.

[quote name='d-basser' post='719377' date='Jan 20 2010, 06:12 PM']I dont really have volume issues, I can keep the gain pretty low and get good volume but I will never be using a really really distorted sound so I would like a bit more play at the lower drive end. Philips 5751s look like they may be what I need.[/quote] Just remembered it was Colomor. They have an Ebay store now.

[quote name='d-basser' post='719347' date='Jan 20 2010, 05:55 PM']Thanks for the info obbm, what brand did you opt for? Where did you pick them up?[/quote] When I had gain problems with a BBE BMAX-T I bought a few Philips JAN 5751 from an outfit in Sussex. They always come up Ebay.

[quote name='d-basser' post='719241' date='Jan 20 2010, 04:49 PM']There is two 12AX7s in the Orange, I assume I would just replace both with ECC81s. Total noob in all things valve, is it just a case of taking the old ones out and putting the new style in or is there more to it than that?[/quote] I think you might be taking out too much gain by doing that. When I have some time I'm going to put a pair of 5751s into mine. I put a pair into an EH English Muffn and it sounded really good now. Swapping pre-amp valves is very easy. Remove valve, line-up pins, insert new valve. Job done.

[quote name='BottomEndian' post='717821' date='Jan 19 2010, 01:42 PM']I don't really understand why Warwick didn't use the word "Speakon" in their manual. Would they have to pay Neutrik for the privilege of doing so? Or is it just bad translation from German?[/quote] To the uninitiated a Speakon socket's appearance would suggest that it is co-axial. I had a look at the cab schematics and they are all normal Speakon 1+/1-.

[quote name='dave_bass5' post='717038' date='Jan 18 2010, 08:01 PM']Ok, thanks guys. So, we are talking about SR's here aren't we. Does the Sub use the same electrics or could it be a cheaper version?[/quote] SR4 2-band pre-amp is pretty basic and a very old design so I would imagine its the same. Best way to find out is ask at the EBMM Forum.

[quote name='OutToPlayJazz' post='716922' date='Jan 18 2010, 06:59 PM']Just to clarify Dave, the 2eq MM preamp is boost only. The 3eq is cut/boost. That's why the 2eq models always seem more powerful. I prefer to the 2eq's, to be honest. Much more rounded and richer sound. Rich.[/quote] Sorry to disagree but John East did a careful analysis of the 2-band when he was designing his equivalent unit. His finding were posted on the original Dudepit Forum. The bass is boost only however because of the way that the circuit is designed it gives the effect of slight cut/boost. The treble is genuine cut/boost. If you don't believe me then ask John.

[quote name='Platypus' post='714410' date='Jan 15 2010, 10:12 PM']NV212[/quote] +1 I'd probably sell my Epifanis for one of those.

[quote name='coxswain' post='713754' date='Jan 15 2010, 01:57 PM']@obbm I'm in Bristol, know any good techs in this area? Thanks for the help, guys[/quote] Not my area I'm afraid but there are plenty of Bristol based members here. The other alternative is to get it back to Ashdown.

So who bought it for £410?

I had a similar effect when I blew-up the power supply of my Ashdown ABM500. I strongly recvommend that you take it to a Tech and get it checked. Where are you?

[quote name='Al Heeley' post='711778' date='Jan 13 2010, 07:15 PM']Not wishing to hijack the thread but what is the correct convention for wiring them when making a Speakon to 1/4" jack lead?[/quote] For normal cabs: Jack tip to 1+ Jack sleeve to 1-