JohnH89

I am using , when needed , a 35W class D module from ebay for a fiver , from an 18v power tool battery , intlo a PJB C2 cabinet . I bought a Hotone nano bass to use as a preamp but there was no need . A fine sounding little amp that is easily transportable . A 2000mah battery has been tested and was still working 4 hours later . To change the battery takes seconds . This has nowhere near the power of the Briefcase but the battery lasts a hell of a lot longer . This was designed to play a gig that is about an hours walk from the public highway , so the fact that it is a quarter of the weight of the Briefcase is a bonus . I will see if I can dig out some photos and post them here if I find them .

Love the walnut . Not a huge fan of the holes , but if you love it , thats all that matters .

No Ric hate from me . Still love the look , sound and general idea of them . But on the 2 occasions I have played them with a view to purchase , I just can't get on with them . Still not given up yet !

Owned both Harleys from the 70's and 80's , and went to buy a brand new Ric a couple of years ago . Both overpriced and overvalued . The HD's were sold and the Ric was never purchased . They both live on a reputation that is a lie . Squegee the third eye my friends ......

Fine choice of bass . Mine has hipshots and a supertone bridge along with Roto tapes on it . Absolutely no real need to modify it though . Its a keeper for the rest of my natural life . Enjoy .

I love a P bass . The best one I ever had was a Yamaha BB734 . Still own it . LaBella Jamerson flats . The only bass that has remained standard . The best kept secret .

As above , card scrapers are my go to for finishing fingerboards on uprights and fretless . Take your time and learn how to put an edge on them . Its not hard . Also hand planes are fine tools but again , learn how to put an edge on the iron properly . After plenty of practice and patience , I can level a fretless fingerboard so you can balance a ball bearing on it without it rolling off . Also a decent (not cheap ) japanese saw .

Welcome the wonderful world of tapewounds . Been using Roto88s almost exclusively for 5 years . Epiphone Jack Casady , piezo jazz fretless and P bass bitsa fretless . The only bass that does not have them is my latest . A Yamaha BB734 with LaBella Jamerson flats . They have a sound to die for on the fretlesses and in my opinion are perfect on the JCB .

Blimey mate ! thats a new one on me . At least the cost of flats and tapes are less than rounds , if you factor in the length of time they last . Put some Labellas on my new BB734 a few months ago , and expect them to last the distance . (mine and the basses )

Always love Rotosounds . Make in the good ol UK .

Thank the lord they didn't .🤭

Absolutely love mine . I have had it for 4 years and it will go in the coffin with me when I croak . They do have their little weirdnesses but well worth the effort of putting up with . Hipshot ultralites on mine cos I had them sitting around and a supertone bridge from Hipshot cos I am not a fanboy of the Gibson 3 point bridge . Strung with Roto tapes and used for everything from folk to punk . A very versatile bass . Not much of a neckdiver but that doesn't bother me that much . With the strap button on the neck heel it can lean away from you , but a long strap and a slight change in technique fixed that . The button can be moved to the top horn with a little work . Buy one and be openminded and adaptable enough to appreciate it .

The best kept secret ever . BBs are awesome .

I think we knew that . Well , you did and I believed you . Cheers Mon Ami .

A quick update for you who may be interested . Played my Yamaha BB734 through the amp for 2 hours at a rehersal tonight . Sounded great to me and compliments from other band members . Had it up way too loud and made the point it was to stress test the amp . It coped with the above plus 20 minutes or so idling between songs . A couple of quieter tunes to give the ears a rest and finished up with a full on hammering . Now here is the thing ...... No noticeable heat at all . Played with it on its side for a couple of minutes at the end , and no noticeable heat from the upper reflex port . Not even detectable above ambient temperature . I couldn't tell you if the fan even ran as it would be impossible to hear unless cabinet was dismantled . The rehersal space is centrally heated to 21 degrees (70 F) . Very pleased all round , the only possible casualties are the windows which got rattled a bit . Thank you all for your help , assistance and ideas . Any further reports or problems in the future I will post it here .

'My calculations show that with 25 degrees C ambient, a 31cm x 31cm x 31cm wood box with nominal 12mm thickness, the final temperature after "forever" (called the asymptotic limit) will be 33 degrees C with an 8 degrees C total temperature rise. This is about what I would expect worst case, pretty much trivial. Here's one handy enclosure calculator, there are several. These sorts of formulas are also used in the heating and air conditioning industry too, the walls will have a thermal resistance, and if playing in the sun there will also be heat gain due to radiation.' Cheers for that . Way beyond my comprehension but I have confidence in the design . For info , cabinet measures 395mm on each side of the cube (internal measurement ) . 2 x 75mm ports in the lower part of the rear plate . Cabinet is built from 9mm ply , laminated to 18mm across approx 65% of surface area . Baffle and rear panel from 18mm MDF . I will really try and destruction test it tomorrow . If it survives ( it will ) I will buy myself a beer . And those that have helped can have one on me . 😀 #downunderwonder . Just what is your obsession with the sideways thing ? I said I would do it just to please you . Just wait for some empirical evidence . Not long now .......

The BQ250 has a thermal cutout . Let me try a real world scenario later this week and I promise I will get back to you . To please #downunderwonder I will even turn it on its side and check the temperature of the upper port .

Because , my learned friend , I am , maybe optimistically , confident that the original design , all things considered , has a far better than even chance of being absolutely fine . If you can wait until thursday late evening or more likely Friday morning GMT , then we will know for sure . I think you may have misunderstood #agedhorse and his very well informed opinions but I will leave that between the two of you . He has quite a background in design and development of bass amplification . Be assured that I will post the results of a test and will willingly admit if my assumptions/calculations prove inaccurate .

The BQ250 is a lot bigger than the BAM200/Warwick gnome/TE Elf with better heatsinking and considerably more venting and bigger fan .

As pointed out , the case and heatsinking on the BQ250 is a lot larger than the Warwick . I have also come across the following from TC electronics Which is a 750 combo using this head Also vented from the side and a lot less airflow than the BQ250 . My money is still on the little BQ having adequate cooling .

Thanks for your concern . We'll try it out first . Two small ports at the top of the rear panel , ducted to the fan / outlet will take care of that if necessary . I'll have a virtual bet with you to see if I can get it to overheat at rehersal this week . I'll try hard 🤪

I understand your comments and concerns but am very aware of how it all works . I really don't foresee a problem but will give it a hard run at rehersal on Thursday and let you all know how it works out . I have used the head a lot in the past and even when driven hard for a long period , it barely gets warm . At approx 95% efficiency , at full power constantly of 250W (which it is nowhere near with normal playing ) it would have to dissipate a lowly 12.5W . If it turns out that there is a problem , the amp will protect itself and cut out . If it does I will design a forced cooling duct system for it . I'll keep you posted .

We'll see . I am not expecting any problems but can always add forced ducting if necessary . I have driven the amp flat out for 4 hours without the fan coming on for more than a few minutes when it was sat on top of the cab . I like the idea of it on its side as a simple solution if there is a problem .

Amp is mounted to the back board via 4 bolts and a ply pressure plate . The sides of the case are free for air to move . On the BQ250 , the fan and vent are mounted on the side of the case . With the amount of air that moves with the 12in driver , I would be very surprised if I have an overheating problem .

It does deep very well in a well designed cabinet .