Show posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Show posts Menu

Messages - guzzis3

Amplifier Discussion / Re: 12w Marshall
January 26, 2023, 07:02:30 PM
Thank you phatt. Does this trickery explain why it's as loud into 16 ohms as 8 ? I just assumed that as you loaded the outpput of the transistors it's decrease power ?

I wasn't interested in distortion, I just wanted something for practise. If I wanted singing distortion in a SS amp I'd build a Lead 12. (see what I did there?)

Hotone have built a floor mount amp with 2 of the models built in. The one I would buy is the Britwind which combines a plexi and AC30 in a 70W package, but they are far too expensive for what they are..

As I say I can knock together a valve amp in some hours mostly from stuff I have laying around, but that was never the problem I was trying to solve.

Anyway have fun!
Amplifier Discussion / Re: 12w Marshall
January 23, 2023, 07:50:19 PM
Ebay. The seller is in Australia and the power supply is correct. It's very clean, no distortion at all but I think it must have some shape to the response curve, probably drop off at low and high like a valve amp. $71 and some cents.

Getting into ambiguous terms. I don't have a spectrum analyzer so I can't be precise, but it sounds a bit warm or creamy or something, not cold and precise like say a hifi amp with the impedance fixed to accept a guitar in. By comparison the 2 valvestates and the vox pathfinder sounded "glassy" clean with a lot of top end. I usually like bright amps but they are just too much. It doesn't help that I don't understand the knobs..

There are lots of clips on ewtube but they seem to exaggerate the distortion. For want of a better reference it sounds like a really nice fender clean.

Well if we are drifting off topic I have a question if I may. The amp says "class D". I don't know what that means. Normally a SS amp is less loud into 16 ohms than 8 then 4. This seems not to be the case. I am running it into a 4x12 (8 ohms) wired as 2x2x12 at 16 ohms. Plug in one and flat out it's about right for practice. Plug in both pairs in parallel it should be seeing 8 ohms but there is no discernible increase in volume. I don't understand this. The speakers are chinese celestions.

As I say I've a second coming. With the GT8 and the 2x2x12 it should give some pleasant stereo chorus etc sounds if I want to play with that.

Amplifier Discussion / Re: 12w Marshall
January 22, 2023, 07:32:20 PM
I have invaded this thread and it's drifted way off topic. If you really want to continue this line of discussion please start a new thread.

I will just make one more comment though. I can build a valve amp in a few hours. I've never built a copy valve marshall. I avoid complicated preamps, I've never really used the tone knob on the guitar let alone preamps on an amp. Volume is all I need. I just wanted a nice clean amp for quick practice not a deluxe rig. I've been quite surprised at how hard this has been. 3 practice amps, all very ordinary. I have ordered a second hotone boogie siva. I don't know what they did with that but it sounds very nice and at $72 delivered it's cheap enough. It will do.

It still might be interesting though to build a stereo Lead 12/30 or whatever and see what can be had from that into 2x2x12 speakers.

It is afterall just a bit of fun :)
Amplifier Discussion / Re: 12w Marshall
January 22, 2023, 12:33:51 AM
I have several valve amps. I've built quite a few over the years but people keep talking me into selling them, then I have to build more. Blessed bother.

These last some years I have had many occasions when I have maybe 1/2 hour or something for a quick practise. I am reluctant to use valves for this. I have a limited stock of old valves and when they are gone I will be condemned to the modern market of overpriced NOS or awful new valves.

So I went looking for an alternative. SS is the obvious answer. It needn't distort but I would like something "nice.

I bought a Vox Pathfinder 10, too bright. Marshall VS15 (UK) nicer but still a bit glassy. 8020 despite the 10" speaker is ok but not great. It also needs repairs. Reverb does not work and I suspect there may be more amiss.

I got a Hotone Boogie Siva which arrived the other day. I've ordered a second. VERY nice clean amp. No distortion but it sounds like a clean valve amp. Into a 2x2x12. I'm quite shocked.

Also as a result of my gumtree ad a chap in SA has contacted me about swapping my 8008 for his 8200. The bi chorus has some issues (seems common among the valvestates). We shall see what comes of this.

Not sure what I am going to do with the valvestate combos. The hotones will do me just fine. I am quite surprised at how nice it is. Perhapse if the price of the purple wind or the vox copy (can't remember the name) come down I'll get some of them. At $140 though they are a bit rich for me atm.
Amplifier Discussion / Re: 12w Marshall
January 20, 2023, 10:01:58 PM
Thank you for the replies.

Morayfield! Goodness it's a small world. I'm at Mt Crosby.

Yes I now unfortunately am on the pension. Humiliating but I'd run out of options. The blindness is one of several problems.

I found your thread on the 100W models also. I assume all these generate clipping in the preamp and you can dial it in at different volumes ? Maybe I'll build one of those instead. I have developed an interest in stereo setups though. Some of the effects sound a lot better on 2 channels. I could hang on to the 8008 and build a preamp to feed it. Another option.

A PCB would be helpful though. I've built on..tag strips ? before. I forget what they are called. When you get a lot of components that can get messy. Building a pair of preamps though should be manageable.

Limited component availability is disappointing.

I'm not looking for distortion, just an amp with terrible frequency response :D I've got a Boss GT8 and of course if I want a singing sound I've any number of valve amps to play with.

I have grabbed an 8020 and VS15 at very good prices but it's surprising how disappointing both are. The VS15 oddly seems to be the nicer clean amp. The 8020 need a bit of help. Reverb seems not to work and I suspect other problems. Perhaps there is a mouse living in there.

I have a plexi marshall major. Bought it when I was young and dumb. There was a super lead, lead and major second hand. The lead and major were the same money, the super lead was out of my price range. It would have been better had I bought the lead but I figured if I couldn't be good I'd be loud :D Oh to be young again.
Amplifier Discussion / Re: 12w Marshall
January 18, 2023, 09:05:19 PM

If you had to order extra PCBs that you want to sell I'd be very happy to buy them from you. I am in Brisbane,

This is my first post to this forum. I was pointed to this thread by a person on the marshall forum. I've been building electronic stuff since I was a kid but while I have built quite a few valve guitar amps I've not built a SS one.

I have the complication that I had 2 strokes in 2020 and am now part blind. The part of my brain that processes the written word was also damaged so I can barely read. I don't mention this looking for sympathy. I just need to explain sometimes I can't read things and sometimes it takes me a long time to get to things, so your patience is much appreciated.

I have a 8008 marshall power amp, 80w a side into 4 ohms. I could build a stereo preamp and run it into that or build a stereo amp including output stage. Have you determined if the 5005 etc develop their distortion in the preamp, power section or both ?

I realise you haven't finished your design, and there may be problems, but starting even with a flawed PCB is probably easier than laying it out on tag strips or breadboard.

Thank you for reading.