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Messages - flester

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1
Tubes and Hybrids / Re: 12 v tube preamp
« on: Today at 04:32:08 AM »
I ordered some 12*U7 and sockets and am going to give this a try.
I see that there are some hybrid amps e.g. the Orange Tiny Terror which has a 12 AX7 preamp and uses a 15v power supply. Is that likely to be a starved plate or is the voltage stepped up internally? Is this a realistic option for DIY?

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2
I had been wondering about those. It is sort of suggested that they have all the goodness of tubes without the drawbacks. I wonder...

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3
Tubes and Hybrids / 12 v tube preamp
« on: December 17, 2019, 12:25:40 PM »
I've seen a few references to building tube preamps e.g. https://www.instructables.com/id/The-ValveLiTzer-Low-voltage-Tube-Booster/
https://www.instructables.com/id/The-Valve-Caster-20-Tube-Boost-and-Overdrive/
Any comments on whether this is worth doing e.g. will it really sound any different to  solid state version?

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4
Preamps and Effects / Re: So you need a preamp - here are your options
« on: November 29, 2019, 05:44:46 AM »
OK I built up a buffer with MPF102. Definitely brightens the sound compared to going directly into my Kemo 40w power amp but less so in front of the TDA2003 or the LM386. This is using a 6" speaker, and fairly short guitar cables. Now to try it via my 1x12 and longer cables.

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5
Preamps and Effects / Re: So you need a preamp - here are your options
« on: November 07, 2019, 05:03:55 PM »
Thanks for that. Think I'll just get some MPF102 and J201's as recommended.

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6
Preamps and Effects / Re: So you need a preamp - here are your options
« on: November 06, 2019, 06:44:31 PM »
these are the ones I've tried without success but maybe I need to mess around a bit more

http://www.farnell.com/datasheets/2304095.pdf?_ga=2.184256102.1389724509.1573081103-1254332340.1566743493

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7
Preamps and Effects / Re: So you need a preamp - here are your options
« on: November 06, 2019, 06:25:32 PM »
Thanks for that. I think this one may fall into the correct range.
http://www.farnell.com/datasheets/1796807.pdf?_ga=2.8128754.1389724509.1573081103-1254332340.1566743493

I note that the datasheet says , it used for '... low level switching...chopper-stablilised amplifiers...' etc. DOes that have a bearing on my intended use?

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8
Preamps and Effects / Re: So you need a preamp - here are your options
« on: November 04, 2019, 05:36:00 AM »
Could I get some guidance on how to select 'equivalent' transistors, for example where a J201 or MPF102 is specified but not available. Apart from just googling 'J201 equivalent', is there way to select based on specs in the data sheet? At present I am planning a preamp to go in front of my TDA2003 amp.

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9
Small bass amps are sometimes recommended for cleans. Also check out some Steel Guitar forums.
They often favour clean SS tones with Peavey and the Roland Cube range often coming up (though the latter use modelling a lot).

10
Preamps and Effects / Re: Rechargeable 9v batteries for fx pedals
« on: July 07, 2019, 04:11:22 AM »
The ones I have are a few years old and Ni-Cad. I was using them to power a TDA2003 amp drawing up to 500mA. My hungriest battery driven pedal draws 30mA and the rest are single figures.

Maybe I just need a newer set of batteries. Worst case I leave a pedal powered on overnight and need a new battery.

11
Preamps and Effects / Rechargeable 9v batteries for fx pedals
« on: July 06, 2019, 02:35:32 PM »
Are Rechargeable 9v batteries a viable option for pedals?

Just asking cos I have some, and I broke my fx power supply. The ones I have claim 350 mAh capacity but interestingly the only major brand ones I can find are Duracell with 170 mAh. Are the claimed mAh values reliable in your experience?

12
Amplifier Discussion / Reverse polarity protection
« on: February 07, 2019, 05:08:25 AM »
I neglected to add reverse protection to my LM386 amp and broke. It is basically the Little Gem/Smokey amp.
https://goo.gl/images/3dqb9b
 It powers on but no output. I am checking all the caps and the IC.
Anything else I should check?
What type of diode should I (have) use(ed) for reverse polarity?

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13
Surely the Tube Sound happened by accident. Tube amplifiers were used to make guitars louder and they did. Then SS amplifiers were used and they also made guitars louder using smaller components and less energy. But they sounded different. Why should we strive to make them sound tubey?

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14
Amplifier Discussion / Re: Grounding techniques
« on: February 05, 2019, 12:05:18 PM »
The mains adapter that worked has now died. Any tips on how to buy a new one that is not noisy?

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15
I would. I don't know the actual product but I've often bought stuff that 'sounds terrible' and been delighted with it. Even as a cab it would be cool. Stuff like sealant/glue around speakers should be easy to fix. Maybe some say  'sounds terrible' because its solid state.

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