Please recommend an amp for heavier picking style

[erwin_ve]

OK!

[bluesfendermanblues]

For what it's worth, that it not actually the case. What I did -- and never in an amp with 100K plate load resistors -- is put a .0047uF (so, 4.7nF, NOT 47) in PARALLEL with a 4.7 Meg resistor before the 220K pre OD trimmer (100K).

Cheers,

Gil

Ok so in a high plate, Non-hrm amp, you used a 4.7n in parallel with a 4.7. Mohm equalling a cut at 7 hz. Hmmm thats not a lot of low cut I thought the 4.7 Mohm resistor went to ground??

What would you use in a 100k plate load resistor amp?

It's not creating a knee for the resistor, the 4,7M is only reffering to a virtual ground. Look at these posts: https://tubeamparchive.com/viewtopic.ph ... sc&start=0

Gil, wrote that the components were in PARALLEL, so they are creating a knee frequency.

[erwin_ve]

I know they are in parallel, I installed it in my non-HRM.
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[ayan]

Ok, to understand you correct

In a high plate (220k/150K), Non-hrm amp, you used a 4.7n in parallel with a 4.7. Mohm, equalling a cut at 7 hz. Hmmm thats not a lot of low cut

In low plate (100K) Non-hrm amp, you used the mod consisting of a 4.7m resistor between OD input and ground followed by a 47n (0.047uF) capacitor in series with the other end of the resistor and OD input. And if the V1b capacitor is also 47n you would arrive at 23.5n, when the OD is engaged and the knee, created with the 220k + 100k trimmer would give a knee freq at 21 Hz, cutting off some of the 100K ormph mud.

Correct?? please verify

The frequency break point you calculate is not accurate. That would only apply if the network was isolated at the input and the output, but it is not isiolated on either end. The .0047uF cap, in overdrive mode, is in series with the .047uF coupling cap out of V1B. Thus, instead of .047uF, the coupling cap becomes .0043uF. The difference between .047uF and .0043uF is very noticeable.

I don't know what you are describing in the second paragraph. In the case of the 100K plate load amps, I use nothing between the coupling cap out of V1B and the entrance to the overdrive (which is a 220K resistor followed by a 100K trimmer to ground).

Gil

[bluesfendermanblues]

The frequency break point you calculate is not accurate. That would only apply if the network was isolated at the input and the output, but it is not isiolated on either end. The .0047uF cap, in overdrive mode, is in series with the .047uF coupling cap out of V1B. Thus, instead of .047uF, the coupling cap becomes .0043uF. The difference between .047uF and .0043uF is very noticeable.
Gil

Ok, that amounts to a 116 Hz knee, instead (was confused by 'Parallel' - never mind )

I don't know what you are describing in the second paragraph. In the case of the 100K plate load amps, I use nothing between the coupling cap out of V1B and the entrance to the overdrive (which is a 220K resistor followed by a 100K trimmer to ground).
Gil

Ok, what coupling cap are you using out of V1B in a 100k amp? 47n or perhaps 10n, like the TwoRock schematic

[ayan]

The frequency break point you calculate is not accurate. That would only apply if the network was isolated at the input and the output, but it is not isiolated on either end. The .0047uF cap, in overdrive mode, is in series with the .047uF coupling cap out of V1B. Thus, instead of .047uF, the coupling cap becomes .0043uF. The difference between .047uF and .0043uF is very noticeable.
Gil

Ok, that amounts to a 116 Hz knee, instead (was confused by 'Parallel' - never mind )

I don't know what you are describing in the second paragraph. In the case of the 100K plate load amps, I use nothing between the coupling cap out of V1B and the entrance to the overdrive (which is a 220K resistor followed by a 100K trimmer to ground).
Gil

Ok, what coupling cap are you using out of V1B in a 100k amp? 47n or perhaps 10n, like the TwoRock schematic

I use .047uF with the 100K amps.

Gil

[bluesfendermanblues]

The frequency break point you calculate is not accurate. That would only apply if the network was isolated at the input and the output, but it is not isiolated on either end. The .0047uF cap, in overdrive mode, is in series with the .047uF coupling cap out of V1B. Thus, instead of .047uF, the coupling cap becomes .0043uF. The difference between .047uF and .0043uF is very noticeable.
Gil

Ok, that amounts to a 116 Hz knee, instead (was confused by 'Parallel' - never mind )

I don't know what you are describing in the second paragraph. In the case of the 100K plate load amps, I use nothing between the coupling cap out of V1B and the entrance to the overdrive (which is a 220K resistor followed by a 100K trimmer to ground).
Gil

Ok, what coupling cap are you using out of V1B in a 100k amp? 47n or perhaps 10n, like the TwoRock schematic

I use .047uF with the 100K amps.

Gil

Hi Gil, thanks for the info.

Two questions more....
a) would you use the 4.7n entrance mod in an amp to be played mainly with strats.

b) Which amp(s) are you playing in the "Doctor Wu's EPK" video? - great stratish RF sound at the outro.

[ayan]

Hi Gil, thanks for the info.

Two questions more....
a) would you use the 4.7n entrance mod in an amp to be played mainly with strats.

b) Which amp(s) are you playing in the "Doctor Wu's EPK" video? - great stratish RF sound at the outro.

Hi,

Hmm... I guess it depends on the Strat question. The amp in the EPK video was a 220/150K amp, with the .0047uF//4/7Meg deal AND with a classic style tone stack: //.1uF bass, .047uF middle and 330pF treble, with a 150K slope resistor. To me, that was very Strat-friendly and my favorite type of amp for a long time. I guess that would be a "yes" to your first question... unless you were using a classic 100K amp, which I tried briefly about 10 years ago and didn't like. Perhaps I would like that now, who knows.

I did move on to the 100K plate Skyliners and don't have any classic amps anymore. These are not as Strat friendly but they are fatter sounding, which has some advantages. You could say that they are some kind of compromise between an older classic ODS and a high plate Skyliner type -- which just doesn't do it for me.

Cheers,

Gil

[bluesfendermanblues]

Hi Gil, thanks for the info.

Two questions more....
a) would you use the 4.7n entrance mod in an amp to be played mainly with strats.

b) Which amp(s) are you playing in the "Doctor Wu's EPK" video? - great stratish RF sound at the outro.

Hi,

Hmm... I guess it depends on the Strat question. The amp in the EPK video was a 220/150K amp, with the .0047uF//4/7Meg deal AND with a classic style tone stack: //.1uF bass, .047uF middle and 330pF treble, with a 150K slope resistor. To me, that was very Strat-friendly and my favorite type of amp for a long time. I guess that would be a "yes" to your first question... unless you were using a classic 100K amp, which I tried briefly about 10 years ago and didn't like. Perhaps I would like that now, who knows.

I did move on to the 100K plate Skyliners and don't have any classic amps anymore. These are not as Strat friendly but they are fatter sounding, which has some advantages. You could say that they are some kind of compromise between an older classic ODS and a high plate Skyliner type -- which just doesn't do it for me.

Cheers,

Gil

Hi Gil, thanks for your reply -
My NON-hrm 50w is a hybrid with 100k on V1 and 220/150 on V2. The tonestack is 100k slope and 47n mid cap. This setup seems to go nicely with a strat.

(By the way my strat is a Fender 62RI with
SD antiquity in neck,
Van Zandt in the mid and
SD twangbanger in the bridge pos.
Further upgraded with Callaham trem block and titanium saddles.)

[Structo]

Strange, I remember when this was talked about and I totally missed the 4M7 resistor.

When we came up with the Tweaked D'Lite layout, courtesy of Moss, it just showed the .05uf cap in series with the 220K resistor, so that is the way I did it.
It does show a 10M resistor going from the cap to ground so maybe that accomplishes the same thing as far as a anti-pop resistor.

I believe I have a .02uf on V1b.

I remember when I installed that cap on the OD entrance, it thinned the OD out in a good way for me, my bass was too woofy in OD previously.

What would adding the 4M7 in parallel with the .05uf cap do now?

[Structo]

I just checked some photos of my amp.
I have a .05uf on V1b so my total in series is .025uf for OD.

Both V1 and V2 are high plates.

[bluesfendermanblues]

It does show a 10M resistor going from the cap to ground so maybe that accomplishes the same thing as far as a anti-pop resistor.

Yes, exactly the same. 10M or 4M7 doesn't matter.

I remember when I installed that cap on the OD entrance, it thinned the OD out in a good way for me, my bass was too woofy in OD previously.

Because you are playing guitars with humbuckers and not a strat/tele player?

[Structo]

Heheheh, actually as of late, my go to guitar is a cheap dual humbucker guitar I built.
Sounds great!
But historically I have always been a strat guy with the occasional tele thrown in.

Weird that I don't remember the resistor being mentioned in parallel with the OD entrance cap.
I remember it being said that there was one from the cap to ground for a pop killer.
Not sure if that was for the switch or relay but I have OD and PAB on relays.
And that was the way the layout was drawn.
I wonder what it would do to add that now?

Interesting the difference between the 100K and high plate value amps.

Mine is 220K/150K on both tubes.

I tried the .01uf mid cap and didn't care for it. But kept the 250K mid pot.
I suppose I could put a .05 and .01 cap on a push/pull volume pot for versatility.

I have 4.7uf bypass caps on both tubes as well.
I may have a 1uf on V2b or a, can't remember.
I'm pretty happy with the amps tone.
Still fighting a bit of fizz though.