EVH 5150 III: 50 vs 100 watt

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MXR117
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Re: EVH 5150 III: 50 vs 100 watt

Post by MXR117 » Sun Jan 20, 2013 7:52 am

evh0u812 wrote:Sure.
Green/Blue channel-
10k voltage divider to 42k
This raises the clean level and increase gain slightly.

250pf mica on the 100k plate of the second triode.
Smoothes out top end on the blue channel.

Red channel -
Removed the 2 1uf cathode bypass caps C16 and C30.
Lowers the gain and makes the gain pot more useable across the range.

Replace 47pf on the PI with 100pf.

Still looking at the power supply filtering, but thats it for now.
So changing R79 increases the level (volume) of the clean channel and increases the gain on both channels?
So with the gain pot in the middle position the clean channel is much louder ?And more distorted?Is the effect the same as turning the Gain Pot 20 % up volume and distortion- wise?
Are the components on the board crimped and additionally soldered?

What is the 100 k plate resistor in the schematic, R85???


Thanks!

MXR

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Re: EVH 5150 III: 50 vs 100 watt

Post by xhennex » Mon Jan 21, 2013 11:01 am

Hi,

I took a closer look at the schematics today and there are 2 possible approaches that should not influence the tone:

#1: Add a relay and a volume pot for the first channel. The relay(between R5 and R4) had to select between R5 and the additional pot on channel switch.

#2: Lower the signal of channel 2 by decreasing R104, e.g. to 33k which would make the last stage identical to the last stage of channel 3. I don't know how significant this 10k Reduction would be or what the lowest value for R104 could be. In this context thinking of a higher value for R97 would increase the effekt of lowering the volume of channel 2.

#1 requires some effort and a place for the pot, there are probably dual-pots (push/pull) on the market which would make things easier.
#2 swap one or two resistors to balance the volume of ch1 and ch2 and youre done

Any suggestions ?

Regards,
Henne

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Re: EVH 5150 III: 50 vs 100 watt

Post by MrBeasty » Fri Jan 25, 2013 2:07 am

fhn_lopes wrote:I wonder how it sounds with a 8.9k Bare Knuckle VHII...
It sounds great. In fact it is my favorite pick-up with that amp.

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Re: EVH 5150 III: 50 vs 100 watt

Post by bmf5150 » Sun Jan 27, 2013 9:49 pm

If any of you guys have some extra 6ca7, try them in the the 5153..you might like it...:-)
R.I.P My precious daughter Aubrey Marie May 20th to May 23rd 2006,we love and miss you!
My EVH sound clips.
http://soundclick.com/share?songid=7782093" onclick="window.open(this.href);return false;

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MXR117
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Re: EVH 5150 III: 50 vs 100 watt

Post by MXR117 » Tue Jan 29, 2013 4:25 pm

Anybody tried the mods above??


The sexiest mod could be using dual concentric pots for Gain and volume.....switchable by one or tho relays..


But I found no dual concentric 1 MOhm Pots anywhere...


Still thinking before heating up the iron....


MXR

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Re: EVH 5150 III: 50 vs 100 watt

Post by xhennex » Wed Jan 30, 2013 4:09 am

Hi,

I`ll give it a try at the weekend and post the results here,
cannot wait till warranty expires.

Howard Kaplan replied to the questions on my mod-proposals on gearpage:
http://www.thegearpage.net/board/showth ... 59&page=71" onclick="window.open(this.href);return false;


Regards,
Henne

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Re: EVH 5150 III: 50 vs 100 watt

Post by dirtycooter » Fri Feb 01, 2013 10:39 pm

bmf5150 wrote:If any of you guys have some extra 6ca7, try them in the the 5153..you might like it...:-)
You try this?? Hows it sound??

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Re: EVH 5150 III: 50 vs 100 watt

Post by bmf5150 » Sat Feb 02, 2013 11:11 am

dirtycooter wrote:
evh0u812 wrote:Thats so true about the pickup combination and what this amp likes. I was falling out of love with mine a little as channel 2 was sounding too compressed and just not open enough. Ive been playing a Pat Pend PV Wolf and never thought that the highoutput bridge pickup was the cause of it :bang: . Rewound the pickup to a nice 10.2k and the amp just blooms. Best thing for both the guitar and amp by a long shot.
Try any PAF copy or replica spec 8-9k. Totally another world for the 100watter. Been sayin this all along. Its night and day from the higher output p/u's. Dynamics and crunch has way more body and vintage texture. I am sure it all translates to the 50w.
The ONLY reason to use a hot pickup is to get more gain. Well-this amp already has an assload of it. Try a pickup for eq response and not drive characteristic. Other wise your passin the gain that was on the first records and are gonna literally be two times too much to get the brown most want to hear.
I totally agree, my motor city's 2nd degree black belt sounds amazing through it!!
R.I.P My precious daughter Aubrey Marie May 20th to May 23rd 2006,we love and miss you!
My EVH sound clips.
http://soundclick.com/share?songid=7782093" onclick="window.open(this.href);return false;

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Re: EVH 5150 III: 50 vs 100 watt

Post by bmf5150 » Sat Feb 02, 2013 11:17 am

To my ears the 6ca7 shift the mids a little, give it nor Marshall sound..try it and see what you guys think
R.I.P My precious daughter Aubrey Marie May 20th to May 23rd 2006,we love and miss you!
My EVH sound clips.
http://soundclick.com/share?songid=7782093" onclick="window.open(this.href);return false;

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MXR117
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Re: EVH 5150 III: 50 vs 100 watt

Post by MXR117 » Sun Feb 03, 2013 4:48 pm

guts:


http://i1275.photobucket.com/albums/y46 ... a635d6.jpg" onclick="window.open(this.href);return false;

MXR

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Re: EVH 5150 III: 50 vs 100 watt

Post by xhennex » Thu Feb 07, 2013 4:06 pm

Hex MXR,

have you tried any mod so far ?
I'm so busy at the moment, I didn't even pull one screw out of my amp.
I would try to change that one resistor at first.
I thought about drilling a hole throug the vol-pot axis and installing a pot with a smaller axis as piggy-back,
what would you say?

Regards,
Henne

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Re: EVH 5150 III: 50 vs 100 watt

Post by evh0u812 » Fri Feb 08, 2013 2:51 am

bmf5150 wrote:To my ears the 6ca7 shift the mids a little, give it nor Marshall sound..try it and see what you guys think
Ill try a set of JJ's this weekend, where did you bias them to, 70% dis? Did you take any voltage readings? Ive got a feeling the extra current drain might pull the B+ down a little....could be a good thing, we'll see.

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Re: EVH 5150 III: 50 vs 100 watt

Post by MXR117 » Sat Feb 09, 2013 8:39 am

Hi Henne,

the iron is still cold.
I looked for dual 1 Mohm concentric pots--with no luck.

The only dual pot available is a dual 500 kOhm pot by CTS. Maybe modifying the carbon trace with another regular 1 Mohm CTS Pot would be an option. I haver never done that:)

A swichtable (by relay) resistor or trim pot before the the volume Pot to tame channel 2 the next posibillity (maybe the best one).
We need just one 24 Volt relay, a small extra perfboard one trim pot and some wire. But hacking the pcb is necessary because the volume pot is pcb mounted.


Still thinking

MXR

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Re: EVH 5150 III: 50 vs 100 watt

Post by ErickC » Sun Feb 10, 2013 7:43 pm

Ive never heard the ch 1 cranked on the 5150 III i always figured it would sound very crunchy, but i found this clip of a modded ch 1 and it sounds very marshall-y to my ears

[youtube]http://www.youtube.com/watch?v=uQpOpzko2Kw[/youtube]
[youtube]http://www.youtube.com/watch?v=Ts1PYOgh0Qk[/youtube]

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Re: EVH 5150 III: 50 vs 100 watt

Post by xhennex » Sat Feb 23, 2013 7:23 am

Hey,

I heated up my iron today and found out that a change of R88 (47k) to 330k-380k eliminates the volume jump. :rock:
My Preference is pulling out one contact of R88 and putting a 330k in series wich gives ~380k,
wich I tried out with a 500k pot.
Increasing R88 lowers the volume of channel 2.
At first it seams to lower the bottom end but this was just the decreased level.
I cannot find any difference in sound.
For me the best settings are:
GAIN: 9-12
LOW: 12
MID: 12
HIGH:10
VOLUME:9-12

Regards,
Henne

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