My amp's too agressive

[muff77]

Hi

I have an old 70s Hiwatt 50w with a 2X12" cab loaded with Fane's.

I want the tone as clean as possible but I feel that it's a bit too agressive. It doesn't distort but when I use pedals with the amp they sound a bit too boosted. I've compared the amp with other Hiwatts from the era but and they're much cleaner or milder. Difficult to describe exactly what I mean but can the amp be tuned for a cleaner tone by adjusting the bias, using different tubes or is there another method?

The cab is for some reason loaded with two 8ohm speakers in 4ohm in total. Can this have an effect on the tone?

Thanks!

[darkbluemurder]

Hi,

I am not sure which model it is but have you tried the normal and/or low input? And when you compared it to other Hiwatts did you use the same speaker cabinet?

I have read somewhere that wiring the speakers in series instead of parallel would give less highs but I have not tried this myself. This mod is also only recommendable if your amp can be set to 16 Ohms (wiring to 8 Ohm speakers in series gives 16 Ohms).

If it's only a one channel amp with one input then I would check whether there is a bright cap on the volume control, and if so, take it out.

Cheers Stephan

[muff77]

But can adjusting teh bias make the amp less agressive?

[plexistack]

Yeah you can back off on the bias, try a clean set of power tubes, use a 12at7 or 12au7 preamp tube in V1.

A resistor change can often reduce gain as well, find a _good_ tech.

[ROKY]

Originally Posted by muff77

Hi

I have an old 70s Hiwatt 50w with a 2X12" cab loaded with Fane's.

I want the tone as clean as possible but I feel that it's a bit too agressive. It doesn't distort but when I use pedals with the amp they sound a bit too boosted. I've compared the amp with other Hiwatts from the era but and they're much cleaner or milder. Difficult to describe exactly what I mean but can the amp be tuned for a cleaner tone by adjusting the bias, using different tubes or is there another method?

The cab is for some reason loaded with two 8ohm speakers in 4ohm in total. Can this have an effect on the tone?

Thanks!

I'm not 100% sure I understand your post .

If your dirt pedals sound too 'boosted' you might want to adjust
the gain and levels carefully so they aren't WAY louder than the
clean tone you've set on the amp.

But, again .. I'm not exactly sure what your meaning is about the
amp itself being too ' aggressive '.

I have a Hiwatt 50 myself and it doesn't give me ANY problems
with pedals; quite the contrary .

[FFTT]

How about your guitar and pickups and your attack?

These amps clean up so nice when you lay back on your attack even
with HB's, but you'll get cleaner results easier with single coils or P-90's.

You might have a tech check the bias and cool it down within specs
and look into pre amp tubes with less gain.

[michael.e]

Old Hiwatts do not have a bias control. Something may have drifted from spec, I would have a tech run through it and make sure it was up to snuff.
Then, if it is a 100 watter, sell it to me!

[muff77]

Originally Posted by ROKY

I'm not 100% sure I understand your post .

If your dirt pedals sound too 'boosted' you might want to adjust
the gain and levels carefully so they aren't WAY louder than the
clean tone you've set on the amp.

But, again .. I'm not exactly sure what your meaning is about the
amp itself being too ' aggressive '.

I have a Hiwatt 50 myself and it doesn't give me ANY problems
with pedals; quite the contrary .

Well, I have no problem getting a clean tone from the amp but the clean character - if you know what I mean - sounds a bit too punchy and "in your face". I like the clean tone to have punch and a clear top but in my opinion there's a fine balance between a perfectly balanced clean tone and one that's a hair too nasty.

Doesn't really matter if I adjust the gain or volume on the pedals, because the amp doesn't seem to react that well with high gain pedals all together. I've tried my pedal board on other Hiwatts and it works nicely.

I guess it's a matter of taste but as I feel the difference between mine and the other Hiwatts that I've tried is that evident, I want to see if there's a way to tame it a bit.

[muff77]

Originally Posted by FFTT

How about your guitar and pickups and your attack?

These amps clean up so nice when you lay back on your attack even
with HB's, but you'll get cleaner results easier with single coils or P-90's.

You might have a tech check the bias and cool it down within specs
and look into pre amp tubes with less gain.

My main axe is a US 57 Strat with Custom Shop 69 pickups. Shouldn't be too much power in them to make an impact.

I'll have a tech look at it.

[Passenger84]

I've found that sometimes old tubes can make things sound harsh, as opposed to leaving a 'give' in the sound. Also, pickup height, and over-watted speakers. I'm really not sure if any of that applies, just some experiences I've had. I'd try a tube change, and maybe even a speaker change. And if that doesn't do it, as folks have been mentioning, maybe some lower powered preamp tubes. I've had good luck softening amps with 5751 tubes.

[muff77]

Originally Posted by Passenger84

I've found that sometimes old tubes can make things sound harsh, as opposed to leaving a 'give' in the sound. Also, pickup height, and over-watted speakers. I'm really not sure if any of that applies, just some experiences I've had. I'd try a tube change, and maybe even a speaker change. And if that doesn't do it, as folks have been mentioning, maybe some lower powered preamp tubes. I've had good luck softening amps with 5751 tubes.

Ok, thanks for the tips! I think the "problem" is the amp. The speaker cab, pedal board and guitar/pickups, sound right on/with other identical amps.

[CitizenCain]

Clean and punchy describes HIWATT. Maybe you need a different amp?

[keto]

Originally Posted by CitizenCain

Clean and punchy describes HIWATT. Maybe you need a different amp?

Totally THIS. I have an '81 DR504. Clean + any kind of loud = VERY IN YOUR FACE, it's just the nature of the beast. You can up your pre to get it to compress a bit more, but then it won't be *as* clean. Or, try running a compressor up front to take a bit of the peak off. I personally don't think there's anything wrong with your amp, it describes exactly what mine does and it has fresh tubes and is fresh from a tech trip.

[muff77]

Originally Posted by keto

Totally THIS. I have an '81 DR504. Clean + any kind of loud = VERY IN YOUR FACE, it's just the nature of the beast. You can up your pre to get it to compress a bit more, but then it won't be *as* clean. Or, try running a compressor up front to take a bit of the peak off. I personally don't think there's anything wrong with your amp, it describes exactly what mine does and it has fresh tubes and is fresh from a tech trip.

Well, perhaps I'm being overly picky but we're talking nuances here anyway and I was wondering if there's a way to fine tune it.

I've A/B tested my head with two other Hiwatt 50ws from the same era and they're slightly warmer and not as aggressive.

[Steeltoe]

If you have the 4 input model, the inputs on the top
are the lower gain inputs. Jumpering the channels
gives you the best tones, as you can blend the two,
and set master to taste.