Any folks here know electronics or guitar amps tube type
03-09-2007, 01:27 PM
#22
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: Any folks here know electronics or guitar amps tube type
You're a damn bright injun, tho.
Imagine the sound going from a guitar to your amp as a sine wave (AC sine wave, actually), where it gets converted to a bigger (DC) sine wave for use with a speaker. If you turn the input signal or the gain (amount of amplification aka volume ****) all the way up so that the transistor/tube operates in saturation (meaning it can't provide any more output to the speaker even if the input signal increases, since it's "givin ev'rythin' she's got, Cap'n") then the top and bottoms of the sine wave being output is cut off, flatspotted.
With a tube, this sounds good, with a transistor is sounds like ***.
A SIDstation is built around the SID chip that came in the Commodore 64 back 20-25 years ago. The SID chip was a pretty awesome goddamn ----------ing digital based band pass filter; the c64 was capable of emulating human speech although it took most of the system's capabilities to say a sentence, and endless hours of tweaking to get enunciation correct. I had a c64 for a short period that had a second SID chip installed in it, very cool setup at that time although I wasn't up to speed with it and able to do anything more than adolescent idiot-savant fooling around type stuff. But, I digress.
A SIDstation has 1-4 SID chips in it, although the 4 chip units were hard to come by, and is probably the best in lo-fi retro geekery available to the modern musician who knows digital > analog. They are hard to come by, and getting pricey these days, you'd best hop on it now if you want to be one of the cool kids.
Imagine the sound going from a guitar to your amp as a sine wave (AC sine wave, actually), where it gets converted to a bigger (DC) sine wave for use with a speaker. If you turn the input signal or the gain (amount of amplification aka volume ****) all the way up so that the transistor/tube operates in saturation (meaning it can't provide any more output to the speaker even if the input signal increases, since it's "givin ev'rythin' she's got, Cap'n") then the top and bottoms of the sine wave being output is cut off, flatspotted.
With a tube, this sounds good, with a transistor is sounds like ***.
A SIDstation is built around the SID chip that came in the Commodore 64 back 20-25 years ago. The SID chip was a pretty awesome goddamn ----------ing digital based band pass filter; the c64 was capable of emulating human speech although it took most of the system's capabilities to say a sentence, and endless hours of tweaking to get enunciation correct. I had a c64 for a short period that had a second SID chip installed in it, very cool setup at that time although I wasn't up to speed with it and able to do anything more than adolescent idiot-savant fooling around type stuff. But, I digress.
A SIDstation has 1-4 SID chips in it, although the 4 chip units were hard to come by, and is probably the best in lo-fi retro geekery available to the modern musician who knows digital > analog. They are hard to come by, and getting pricey these days, you'd best hop on it now if you want to be one of the cool kids.
03-09-2007, 01:57 PM
#23
3.0 BAR
Thread Starter
Join Date: Feb 2004
Posts: 7,785
Re: Any folks here know electronics or guitar amps tube type
Ummm alot of the marking are gone on the tubes but I took out all of the tubes and snapped some pics. 6 total but like only 3 had the markings left.
unmarked tubes
and this one had part of the marking still left on it... 6..can't tell what letter it is then another 6. I'm assuming it's a 6V6 though.
unmarked tubes
and this one had part of the marking still left on it... 6..can't tell what letter it is then another 6. I'm assuming it's a 6V6 though.
03-09-2007, 10:14 PM
#25
1.0 BAR
Join Date: Jul 2005
Posts: 231
Re: Any folks here know electronics or guitar amps tube type
Originally Posted by Joseph Davis
You're a damn bright injun, tho.
Imagine the sound going from a guitar to your amp as a sine wave (AC sine wave, actually), where it gets converted to a bigger (DC) sine wave for use with a speaker. If you turn the input signal or the gain (amount of amplification aka volume ****) all the way up so that the transistor/tube operates in saturation (meaning it can't provide any more output to the speaker even if the input signal increases, since it's "givin ev'rythin' she's got, Cap'n") then the top and bottoms of the sine wave being output is cut off, flatspotted.
With a tube, this sounds good, with a transistor is sounds like ***.
A SIDstation is built around the SID chip that came in the Commodore 64 back 20-25 years ago. The SID chip was a pretty awesome goddamn ----------ing digital based band pass filter; the c64 was capable of emulating human speech although it took most of the system's capabilities to say a sentence, and endless hours of tweaking to get enunciation correct. I had a c64 for a short period that had a second SID chip installed in it, very cool setup at that time although I wasn't up to speed with it and able to do anything more than adolescent idiot-savant fooling around type stuff. But, I digress.
A SIDstation has 1-4 SID chips in it, although the 4 chip units were hard to come by, and is probably the best in lo-fi retro geekery available to the modern musician who knows digital > analog. They are hard to come by, and getting pricey these days, you'd best hop on it now if you want to be one of the cool kids.
Imagine the sound going from a guitar to your amp as a sine wave (AC sine wave, actually), where it gets converted to a bigger (DC) sine wave for use with a speaker. If you turn the input signal or the gain (amount of amplification aka volume ****) all the way up so that the transistor/tube operates in saturation (meaning it can't provide any more output to the speaker even if the input signal increases, since it's "givin ev'rythin' she's got, Cap'n") then the top and bottoms of the sine wave being output is cut off, flatspotted.
With a tube, this sounds good, with a transistor is sounds like ***.
A SIDstation is built around the SID chip that came in the Commodore 64 back 20-25 years ago. The SID chip was a pretty awesome goddamn ----------ing digital based band pass filter; the c64 was capable of emulating human speech although it took most of the system's capabilities to say a sentence, and endless hours of tweaking to get enunciation correct. I had a c64 for a short period that had a second SID chip installed in it, very cool setup at that time although I wasn't up to speed with it and able to do anything more than adolescent idiot-savant fooling around type stuff. But, I digress.
A SIDstation has 1-4 SID chips in it, although the 4 chip units were hard to come by, and is probably the best in lo-fi retro geekery available to the modern musician who knows digital > analog. They are hard to come by, and getting pricey these days, you'd best hop on it now if you want to be one of the cool kids.
muahahahaahaaa
03-09-2007, 10:18 PM
#26
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: Any folks here know electronics or guitar amps tube type
Originally Posted by miro_gt
so there are AC and DC sine waves ? ... and the last ones are for use with speakers ?
muahahahaahaaa
muahahahaahaaa
Refresh yourself on a run of the mill common emitter amplifier if you are feeling confused today. :1
03-10-2007, 10:31 AM
#29
1.0 BAR
Join Date: Apr 2006
Posts: 503
Re: Any folks here know electronics or guitar amps tube type
Hmmm, i should really know more about whats being discussed here.
Speakers are driven by an AC current.
The digital bandpass filter you talk about, may be retro, but the modern DSP chips out there would no doubt outperform the SIDS (also the acronym for cot death) system. But probably without the retro chic of distortion left right and centre. Also possibly harder to implement.
fwiw, that jack into the radio is probably for the external aerial. The big rotating bit is a capacitor (can't remember the name at the moment) but forms part of an RC filter which selects the station. You probably want to ditch that. Replacing the resistors in that radio would be a good move, get some nice 1% tolerance resistors in appropriate wattage ratings. They are VERY cheap (maybe $10 bucks to replace everything in that amp, minus the valves).
Speakers are driven by an AC current.
The digital bandpass filter you talk about, may be retro, but the modern DSP chips out there would no doubt outperform the SIDS (also the acronym for cot death) system. But probably without the retro chic of distortion left right and centre. Also possibly harder to implement.
fwiw, that jack into the radio is probably for the external aerial. The big rotating bit is a capacitor (can't remember the name at the moment) but forms part of an RC filter which selects the station. You probably want to ditch that. Replacing the resistors in that radio would be a good move, get some nice 1% tolerance resistors in appropriate wattage ratings. They are VERY cheap (maybe $10 bucks to replace everything in that amp, minus the valves).
03-10-2007, 10:39 AM
#30
3.0 BAR
Thread Starter
Join Date: Feb 2004
Posts: 7,785
Re: Any folks here know electronics or guitar amps tube type
Really? That cheap? Just write down the ratings and run down to radio shizzzack? I don't want to get new ---- only to ditch it when it's converted to a guitar amp. Before I start hacking into it and gotta read up on discharging this ---- cause tube amps ain't something to ---- around with. zzzzzzzzz 
