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JapanAxe

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About JapanAxe

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    Precision-wielding member

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    Swindon

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  1. JapanAxe

    How was your gig last night?

    I am very conscious of this, but the Demeter has no top vents. I usually hang my bar towel on my guitar stand. I do occasionally have a problem with drummers putting their mobile phone on my amp or speaker, with inevitable ray-gun noises when it communicates in any way.
  2. JapanAxe

    How was your gig last night?

    Rather fun actually. Regular gig at a large chain pub, which can get a bit over-lively. Slightly quieter tonight, but lots of young people dancing enthusiastically. Apparently there were quite a few 'freshers' out on the town. I was somewhat mortified to think that it is 39 years since I was a fresher myself! Anyway, I took my Mustang rather than the usual Precision, to give my fretting hand a bit of a rest. It sounded superb - I think it is probably the rockingest bass that I own. Here's me (looking like the BFG's nephew) and my rig:
  3. JapanAxe

    Ashdown LB30 schematic

    Thanks! Another option was the AC30 output stage - I found the schematic for the 'bass' version on the Dr Tube website.
  4. JapanAxe

    Ashdown LB30 schematic

    Just had a quick look at that schematic. The PI/driver is a 12AU7, and it will probably be simplest if I keep that in and follow the circuit from the wiper of the volume pot - before that will be my 6SL7-based B15-style pre-amp. Solid state rectifier for the HT - works for me, as I have no 5V secondary on my PT, and there is enough power available on the 6V heater secondary for four EL84s and four 12AX7s. Am I right in thinking that is cathode biased like an AC30? Yes there will, but first there will be a design-based thread in the Repairs & Technical forum, and in the Tube Amp DIY Builders Facebook group to which I subscribe (where you get people like Rob Robinette and Bruce Egnater chipping in with advice!)
  5. JapanAxe

    Ashdown LB30 schematic

    Thanks @Bigwan, you are a star!
  6. JapanAxe

    Ashdown LB30 schematic

    You may! I have just acquired (as scrap) a Carvin Vintage 33 combo. The cabinet is more than a little distressed, the speaker is blown, but both transformers work. My plan is to take the existing chassis and transformers (and some other useful working parts e.g. switches, pilot light) and convert it to a 30W bass head with the following features: Output section based around four EL84 valves, because that's what the OT is suited for - hence my interest in the LB30 schematic; Preamp based on a 1964 Amped B15 channel; That's about it! I need to make sure that the pre-amp will work with the power amp (i.e. that phase splitter has enough beans to drive all the EL84s), so I will be working on my understanding of push-pull amps and hitting up the forums . Here's the innards as I got the amp, and the almost-gutted chassis:
  7. JapanAxe

    Ashdown LB30 schematic

    Thanks @Bigwan
  8. JapanAxe

    Ashdown LB30 schematic

    Does anyone have a schematic for the Ashdown Little Bastard 30? Or at least the output section. I have a project in mind...
  9. JapanAxe

    The GAS is always greener

    OK, so no need for me to snag a used big-iron Class AB head then. D'oh!
  10. JapanAxe

    The GAS is always greener

    That's an utterly brilliant justification for GAS! Just off to enquire about a big f-off head that might still be for sale...
  11. JapanAxe

    New TC Electronic heads

    That does make sense for the bass guitar, as a clean bass note starts with an amplitude peak which falls away to a much lower sustained level, then decays away. The TC Active Power Management blurb describes how the system heavily limits the initial peak, so that they effectively only have to amplify the remainder of each note. EDIT: Although we should all probably stop worrying about power, and listen to how loud an amp is and whether we like the sound, inevitably we are always going to want numbers to compare.
  12. JapanAxe

    The GAS is always greener

    That's the point, there is no logic to GAS. I have a killer amp and cab yet I still find myself browsing eBay and the BC Marketplace for another amp!
  13. I am the lucky owner of a lovely hybrid bass head, with a valve pre-amp and Class D power amp. Recently I had to carry out a repair on the pre-amp, and it got me thinking about other amps - could an all-valve head be EVEN BETTER? For a while I had been ogling an EBS T90 Classic on Absolute Music's website. I had a gig in Longham on Tuesday night (only 3 miles from the shop), so Mrs Axe and I drove down early and I took a bass and cab in to try it out. It's fair to say I didn't feel the love; it sounded quite nice, but was a bit hissy, and I didn't think it went loud enough before running into distortion - I tried it in their big Live Room, you can't really tell in a demo booth! No sale. Then I toddled off to my gig. My own rig sounded truly wonderful So no more amp GAS then? No, I'm now thinking about building/repairing/modding a 'big iron' conventional transistor amp... And that, folks, nicely demonstrates the illogic of GAS
  14. JapanAxe

    How much?!?

    For only £199.99 you can be the proud owner of this not-very-highly-sought-after Marshall Bass State combo. Except it's 'for spares or not working'. And if you want it posted it's another £39.99. Huh?
  15. JapanAxe

    Hello!

    Welcome Giulio, from another AVRI 63 Fender Precision owner!
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